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10 Best Kids’ Thermals & Long Johns Rated in 2020

last updated Aug 13, 2019

If your baby has noticed it’s cold outside, you’ll want to bundle them up for the brusque months ahead. Thermals and long john underwear are a great way to layer without children feeling too bulky with so much clothing on. Thermals are designed to keep heat in without adding heavy fabric and restricting styles into the mix. Kids can run, jump, and play to their heart's content while still being comfortable and staying warm. There are plenty of different options out there, varying in fabric make-up, color, and design. Whether you’re looking for a two-piece set or an all-in-one suit, we’ve got the goods for you. Check out our ten favorite thermal and long john pieces for 2019!

In a Hurry? The test winner after 37 hrs of research

icon
 Rocky Girls Ultra Soft Fleece
98.7/100 our score
Design
99
Materials
99
Comfort
98
Rocky Girls Ultra Soft Fleece
Why is it better?

Eight different colors to choose from

Cotton and spandex mix

Soft and comfortable

Will keep children warm during colder seasons

Can be worn under outer layers, or as pajamas

In a Hurry? Editors choice:
 Rocky Girls Ultra Soft Fleece
Test Winner: Rocky Girls Ultra Soft Fleece
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Researched Sources
19
Researched Sources
Hours Researching
37
Hours Researching
Products Evaluated
16
Products Evaluated
Last Updated:
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By Cassie Sheets:

We recently updated this article by ensuring that all products were still highly rated and in stock. We also reviewed the information for each product to ensure that it is still accurate.

Sorting Options
Design Materials Comfort By Default
Rank
PictureProduct
Name
Rating
Shops
#1
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
98.7
Design
99 %
Materials
99 %
Comfort
98 %
Price Comparison Last Updated (04.08.21)
Amazon Link
$26.99
#2
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
97
Design
97 %
Materials
96 %
Comfort
98 %
Price Comparison Last Updated (04.08.21)
Amazon Link
$26.99
#3
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
95
Design
95 %
Materials
96 %
Comfort
94 %
Price Comparison Last Updated (04.08.21)
Amazon Link
#4
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
93
Design
94 %
Materials
92 %
Comfort
93 %
Price Comparison Last Updated (04.08.21)
Amazon Link
$12.74
#5
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.3
Design
90 %
Materials
91 %
Comfort
90 %
Price Comparison Last Updated (04.08.21)
Amazon Link
#6
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.3
Design
88 %
Materials
90 %
Comfort
87 %
Price Comparison Last Updated (04.08.21)
Amazon Link
#7
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86
Design
87 %
Materials
85 %
Comfort
86 %
Price Comparison Last Updated (04.08.21)
Amazon Link
$12.98
#8
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
82.3
Design
82 %
Materials
84 %
Comfort
81 %
Price Comparison Last Updated (04.08.21)
Amazon Link
#9
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
80.3
Design
80 %
Materials
79 %
Comfort
82 %
Price Comparison Last Updated (04.08.21)
Amazon Link
#10
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
75
Design
77 %
Materials
75 %
Comfort
73 %
Price Comparison Last Updated (04.08.21)
Amazon Link

10 Best Kids' Thermals & Long Johns Reviewed

1. Rocky Girls Ultra Soft Fleece

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
98.7
 Rocky Girls Ultra Soft Fleece
Amazon Link
Design
99
Materials
99
Comfort
98
best offer for today
Amazon Link
$26.99

Eight different colors to choose from

Cotton and spandex mix

Soft and comfortable

Will keep children warm during colder seasons

Can be worn under outer layers, or as pajamas

Run a little tight for some kids; check the size chart by zooming in on the packaging picture

These seem to pill pretty easily, so they won’t look new for long

When you want to take it back to the basics, this is your go-to. They’re simple but soft and cozy. They can be used indoors or outdoors, and if you’re a fan of the brand, there are adult and boys’ sizes available as well.

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Design

The Rocky Ultra Soft Fleece-Lined Thermal for Girls is designed with your child’s comfort in mind. It features an elastic waistband and moisture-wicking microfibers to accommodate growing, active little girls. This set can be worn as a layer beneath outdoor clothing, or used as super plush and warm pajamas on chilly nights.

Materials

The premium-grade fabrics consist of a 92% polyester, 8% spandex mix to provide the ultimate blend of comfort and functionality. The set comes in eight different colors: black, gray, jade, red, royal blue, coral, white, and lavender. These truly are the best of the basics; they aren’t particularly flashy or frilly, but they’re soft, warm, and simple enough to be universal, whatever your child’s style might be. Rocky also sells larger sizes for teens, and a boys’ fit as well (which is largely the same, minus the scalloped neckline, and with the addition of an opening on the pant). This set will be snug without being too tight, so buy close to your usual size if you intend to use them as a base layer, and size up if you’d like a slightly looser fit (like pajamas).

Comfort

This long john set is guaranteed to keep your little one toasty, whether they’re making snowmen outside, or snuggled up with a book at bedtime. Chilly months often result in head colds, and bouts of the flu, so make sure your family is keeping warm this winter with Rocky thermal sets.

2. Rocky Boy's Ultra Soft Fleece Lined

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
97
 Rocky Boy's Ultra Soft Fleece Lined
Amazon Link
Design
97
Materials
96
Comfort
98
best offer for today
Amazon Link
$26.99

Has fleece-lined microfibers

Stretches for best comfort

Can be worn alone or layered

Size and shape is long-lasting

Retains body heat well

Some parents upset about the stitching quality

Sizes were a problem for some buyers

A full cut is an important feature of this set. They will not shrink either, so the shape will last a long time and not get smaller when washed.

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Design

As pajamas these are great but they can also defend the cold, freezing climates and bad weather. This thermal set is a good mix of warmth, comfort, moisture protection, and elasticity. The full-cut makes this an exceptionally comfortable fit, plus the size and shape are long-lasting. That is because the material is shrinkage controlled. For one of the best thermal sets on the market, try this great one from Rocky Boy.

Materials

Made of 92% polyester and 8% spandex material, this thermal set is offered is a good selection of colors. It has moisture-wicking, fleece-lined microfibers and an elastic waistband, plus the set stretches for best comfort. Wear this item alone or layer it for very cold weather and protection.

Comfort

The combination of being fleece-lined and moisture-wicking is powerful in keeping kids warm during very cold weather or chilly nights. Fleece is not only very warm but it always soft and comfortable.

3. Fruit of the Loom Soft Waffle

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
95
 Fruit of the Loom Soft Waffle
Amazon Link
Design
95
Materials
96
Comfort
94
best offer for today
Amazon Link

Made of 20% cotton and 80% polyester

Is machine washable

Several colors are available

Stretches with you

Itch-free and tag-free comfort

Some say this item is thin and flimsy

Sizes may run a bit small

This set has a pull-on closure and spandex cuffs and collar for the best fit and comfort. These features will retain body heat and keep out the cold drafts.

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Design

This thermal set will retain heat for the best comfort on cold days and night, so kids are the most comfortable. Many colors are offered, so choose a set that will match underwear or outer garments like coats or jackets. This set is perfect for layering or lounging around.

Materials

This waffle thermal from Fruit of the Loom is a fabulous set that is made of 20% cotton and 80% polyester. It has a pull-on closure and itch-free and tag-free comfort. The material stretches with you and is machine washable for easy care. The extra-soft knit set has spandex cuffs and collar and a wicking feature that takes moisture away.

Comfort

The waffle-like material gives this set it wonderful feel that is soft and pulls moisture away from the body. When layering clothes for warmth, this is important to keep down wetness from sweat.

4. At The Buzzer Set

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
93
 At The Buzzer Set
Amazon Link
Design
94
Materials
92
Comfort
93
best offer for today
Amazon Link
$12.74

Is not bulky and fits loose

Durable, breathable, and long-lasting

Has an elastic waistband and tapered legs

High-quality and stylish

Will not irritate seven sensitive skin

Sizes run small – order larger

A few did not like the fabric – was rough

Unlike other thermal sets, this combo is designed to fit the body loose for a breathable fit. Layering will be more comfortable because this base layer will not be tight.

Read more

Design

This thermal set has an elastic waistband and tapered legs. Body heat will be contained, and cold air kept out. Kids will remain warm whether they are indoors or outdoors.

Materials

If you are looking for thermals that are not bulky but can be used as a base layer, then this just may be the set for your child. It is made of 60% cotton and 40% polyester and can be used outdoors or indoors for pajamas. They are durable, breathable, and long-lasting, plus the care is very easy. Machine washing is best because the fabrics will not shrink, and the colors will not bleed.

Comfort

A good selection of colors and sizes are offered for boys of various ages. The pants have an elastic waistband and the legs taper for tucking in shoes or boots for best heat retention. This set is stylish and quality-made, and the material feels good on the skin. Even sensitive skin will not be irritated by the fabrics.

5. Hanes Big Boys' Set

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.3
 Hanes Big Boys' Set
Amazon Link
Design
90
Materials
91
Comfort
90
best offer for today
Amazon Link

Made of 40% polyester and 60% cotton

Is machine washable

The material is waffle knit

Seams are flat and will not rub on skin

A few choices of colors available

Some had issues with sizes running small

The seams opened for a few kids

The seams on this thermal set are flat and will not rub on kids’ skin to cause rashes or other skin irritations. This is important, especially when layering clothes for outdoor wear.

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Design

Hanes makes this great thermal set for boys in a few color choices that are easy to care for. It is machine washable and does not need special care when traveling, camping, or participating in sports. This set is perfect for layering as the first layer that will be close to the skin.

Materials

It is made of 40% polyester and 60% cotton for a wonderful blend that is warm and comfortable. The material is a waffle-knit, and the ankles and cuffs are created of spandex fabric. Body heat will be retained with these closures. Not only are the seams flat, but these are tagless too. Kids will really enjoy these because of these fabulous comfort features.

Comfort

The waffle-knit products are the best for layering because they will wick moisture away from the skin. Moisture close to the skin will actually make kids cold, so the waffle material will prevent this.

6. Fruit of the Loom Active Performance

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.3
 Fruit of the Loom Active Performance
Amazon Link
Design
88
Materials
90
Comfort
87
best offer for today
Amazon Link

Made of 100% polyester

Is machine washable

Perfect for wicking when layering clothes

Great insulation and very warm

Comes in a camouflage, stripes, and cationic heather

Complaints that the material does not breath

The received size was a problem for some buyers

No other thermal set we feature is made of pure polyester, but this one from Fruit of the Loom is exactly that. For wicking purposes, none could be better than this.

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Design

Now your child can trap the heat inside their thermals in style. This top and bottom set comes in a variety of cool colors. Your child can choose between a solid color set such as blue, black, or gray. To enhance their style they can choose a camo set that is available in gray or black. If the exposed waistband isn’t exactly your style, don’t worry. The long sleeve shirt is long enough to cover it while your child is wearing this set. With such affordable prices, your child can own several different pairs. With more than one set in their wardrobe, they can mix and match the sets to create several different stylish combinations. Stock up, winter is coming!

Materials

While the sets are offered in different colors they are all composed of 100% polyester. Parents, you will love how easy it is to clean this set after a day of wintery adventures or several nights of sleeping. All you need to do is throw it in the washer machine and dry it after the washer buzzes. The top of the line stitching and durable material will allow your child to wear this set until they grow out of it.

Comfort

With this set, itchy tags aren’t a thing. Both the shirt and pants are tagless. Polyester is stretchy, thus allowing your child to easily get it on and be comfortable while wearing it. The lightweight feel will have your child forgetting it's even on. While your child might forget they're wearing a thermal set, we can assure it will be doing its job. The material works to keep heat inside, thus your child will be warm and toasty on the coldest days. If they’re wearing this set to play in the snow they can be as active as they want without worrying about sweat. The polyester will wick away moisture, thus keeping your little one warm and dry.

7. 32 DEGREES Heat Base Layer

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86
 32 DEGREES Heat Base Layer
Amazon Link
Design
87
Materials
85
Comfort
86
best offer for today
Amazon Link
$12.98

Good selection of base colors, even camouflage

Made of several great materials

Has a crew neck and elastic waist

Is machine washable

Has stretch comfort and anti-odor features

A few parents say the material is thin

Sizes were a problem for some kids

Not many companies offer colors other than the basic solid colors, but this heat base layer set comes in a camouflage pattern that boys will love. Even girls will like this pattern for pajamas and outdoor sports.

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Design

As with the other thermal sets, you will receive a long-sleeved top and pants for your child to wear. Children of all ages can wear a set from 32 Degrees as they provide sets in small, medium, large, and extra-large sizes. The stretch fit makes it easy for children to slide on their thermals by themselves. The sleek design and different color options give your child the freedom to wear these under clothes or by themselves.

Materials

Both the top and bottom are composed of 49% acrylic, 49% polyester, and 2% spandex. The materials come together to form a set that is anti-static, anti-odor, and machine wash safe. Not only will the set survive countless washes but it also dries quickly.

Comfort

The entire set is lightweight thus allowing your child to feel comfortable while wearing it. The elastic waistband makes the pants easy to put on and provides a pleasant fit. Furthermore, it will help keep cold air from sneaking in. The crew cut neck rides low enough to not cause any discomfort around your child’s neck but high enough to keep your child’s upper body warm.

8. Fruit of the Loom Big Girls' Waffle

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
82.3
 Fruit of the Loom Big Girls' Waffle
Amazon Link
Design
82
Materials
84
Comfort
81
best offer for today
Amazon Link

The fabric is a waffle material that is warm

Wicks away moisture

Several fabulous colors are offered

Extra-soft with spandex cuffs and collar

The material moves with you for activities

The material may not be very soft for some kids

Sizes seem to run small

Fruit of the Loom made this set for girls, so they can stay warm indoors and outdoors. They are almost a necessity in northern climates when doing activities outside.

Read more

Design

Moisture is wicked away by the waffle material that makes up this set of thermals. The company states that only solid colors have this feature. It is very necessary when layering for the outdoors. Not as many choices of thermals are available for girls but sets like this one are made just for them. The sizes and colors are made especially for girls’ tastes and body shapes.

Materials

This set is made of 20% cotton and 80% polyester with a pull-on closure. The fabric is a waffle material which is warm and retains heat well. The cuffs and collar are made of spandex, plus the thermal material moves with you for all activities. This set is easy to care for and machine washable.

Comfort

The pull-on design eliminates any discomfort caused by buttons, ties, or zippers. This thermal set keeps your child warm by wicking away any moisture, thus your child can be warm without being sweaty. The spandex collar and cuffs easily stretch to your child’s body and will not leave them feeling as if it is too tight. The use of cotton and polyester will provide your child with a superior sense of comfort as both materials are soft.

9. Hanes Girls' Set

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
80.3
 Hanes Girls' Set
Amazon Link
Design
80
Materials
79
Comfort
82
best offer for today
Amazon Link

A good selection of colors in brights and pastels

Seams are flat and will not rub the skin

The fabric is a soft waffle material

Will not shrink

Cuffs are made of rib-knit

Some did not like the rib material

Sizes run small – order larger

Thermals for girls are not offered as much as for boys, but great products like this one make up for that. This set is constructed for plenty of action because the seams are double-stitched. Tears will not happen because of the extra care that the manufacturer put into this product.

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Design

Sometimes girls prefer the thermal products offered to boys because of the larger sizes and the fabulous colors, but this product for girls from Hanes has excellent colors they will love. The colors offered are perfect for girls. They can choose from pretty pastels or bright, bold colors that only girls will love. These can be worn as pajamas indoors or outdoors as a thin layer in mild weather.

Materials

This set is made of 40% polyester and 60% cotton fabric and is machine-washable. The seams are flat and will not rub on the skin. Even those with sensitive skin will appreciate this feature. The material will not shrink, and the seams are double-stitched for durability and wearing longevity.

Comfort

Say goodbye to itchy seams. With flat seams and a cotton-poly blend, your child will be nothing but comfortable in this thermal set. The rib-knit cuffs will keep cold air from entering without making your child feel constricted. The waffle material is soft and provides a gentle feel on your child’s skin.

10. City Threads Unisex One Piece

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
75
 City Threads Unisex One Piece
Amazon Link
Design
77
Materials
75
Comfort
73
best offer for today
Amazon Link

Soft, breathable fabric

Available in fifteen different colors

Unisex design

Can be worn as a base layer or on its own

Great for sensitive skin; no harsh dyes or chemicals

No butt flap

Tight around the rear; kids may wind up with wedgies

This onesie is perfect for a fireside cuddle session, or kids can wear it under other layers to play outside. It’s extra soft and will keep everyone cozy this season.

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Design

City Threads touts that not only is it a celebrity-endorsed company (the children of stars such as Christina Aguilera, Ashlee Simpson Wentz, Sandra Bullock, Heidi Klum, and Liev Schrieber all wear this brand), but it’s a company dedicated to helping local economies by manufacturing its products in the USA. This thermal union suit is breathable but warm, soft, and safe for sensitive skins. It is available in fifteen different colors and designed to be unisex, so anyone can enjoy it.

Materials

Made with no harsh chemicals or dyes, little ones can wear this without parents fretting over irritants. It’s made of a cotton and polyester blend and is flexible with a slight stretch. City Threads knows that your kids will want to wear their clothes over and over, so they use high-quality fabrics to ensure longevity and durability. Whether your little one wants to wear their thermal around the house, or as a base layer beneath their outdoor outfits, this City Threads suit could be just right for your family.

Comfort

This one-piece is bound to keep little one nice and cozy. And since it’s a jumpsuit, there’s no way for it to ride up and expose little bellies to the cold air. We know how easy it is to catch that pesky cold, so keep warm this winter!

Criteria Used for Evaluation

Design

Plenty of sizes and colors are available in these choice items we list. Kids can pick their favorites or colors that match other clothes, underwear, jackets, or coats. The colors will not bleed or fade, and the sizes are true. They will not shrink after several washes. Some of the sets are full-cut while others are contoured for kids shapes. Most of the products are for boys, but girls can comfortably wear these too. The size would be the main concern when buying a boy’s set for a girl. Sometimes girls prefer the boy’s items because they may be stronger, thicker, or come in larger sizes than the girls’ sizes.

Materials

Fabrics for long johns and thermals must be the most-durable for long, often wear, especially in the colder climates. Kids will wear these items for long periods, and they must be able to withstand the many activities that kids participate in. Most of these sets are made of cotton, polyester, fleece, and spandex materials. The stitching is strong and sturdy, too. They are easy to clean and will last a long time.

Comfort

The best materials give the best feel, and these sets are created with some of the softest, most comfortable fabrics that thermals and long johns can be made with. Cotton and polyester are the main fabrics of these sets for kids. These materials are flexible, warm, soft, and comfortable. Children can wear them under other clothes and outer garments for layering, or they can be worn alone indoors or outdoors for a light, full coverage.

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Parents, Did You Know?

Research shows that the base layer is the most important piece of clothing during winter months because kids tend to stay out and play in the snow for longer periods.

Parents, Did You Know?

Always look for clothing with wicking design which helps with regulating your child's body temperature and prevents the build-up of sweat and wetness.

Other Factors to Consider

Weather Resistance

It is very important for children to dress appropriately for the weather conditions. Having a good base layer underneath their clothes will keep the kids warm for longer periods and the good materials will prevent sweating and moisture. We did research and rated and reviewed all of our products for their weather resistance features.

Frequently Asked Questions

q: Size is the biggest concern for clothes for kids. What size should a parent buy for their child? One that is the regular clothes size, one bigger, or one smaller?

a:

When purchasing these thermal and long john sets, buy the size that is the same size as the child’s regular clothes for the best fit. If you are concerned about it being too small, then get a size larger, so the child has moving room. Also consider that the child is still growing, so a larger size will give them longer to wear the set.

q: Can a girl wear the boys’ sets and a boy wear the girls’ sets? Some of the colors are not offered in the other sets.

a:

Yes, girls can wear items for boys, but be careful about the sizes. Boys’ sizes tend to run larger than girls’ sizes. Also, the crotch pocket may be an issue for some girls, but this will be up to the parents who do the ordering for them.

q: Are all of these full-length? Are there any that are short-sleeved or half-calf?

a:

Yes, all the sets are full-length. None of them have short sleeves or half lengths on the legs. These are for cold weather, so full coverage is desired for this. The sleeves and legs can be rolled up or folded to get the look you want.

q: What is the best advice for washing these thermals and long johns? Do they need special washing or drying care?

a:

Most of the sets can be washed and dried in the machine. No special instructions are necessary, as these are comfortable clothes that need minimal care. They will not even hold a crease if they are folded, so they are great for traveling.

q: Can you order a different color top than the bottom or do they have to be the same color?

a:

No, none of these sets come in different colors for tops and bottoms. You can make the set you want by purchasing more than one set and mixing them up as you like.

q: Which ones would be the softest to wear, especially for sensitive skin?

a:

The softest thermals and long johns are the ones that are fleece-lined and made mostly of polyester. The ones made of mostly cotton are soft to wear too, but the polyester is a bit softer to the skin. For sensitive skin, choose the ones that are not made with harmful dyes, such as the City Threads Long Johns. Makers will let you know if their products are specially made for kids with skin issues.

q: Would these be too bulky to wear under regular clothes and under a jacket or coat?

a:

No, these would not be bulky to wear for layering clothes. They are designed for that. The material is thin yet warm enough to allow for several layers underneath and on top.

q: Kids will wear these for outdoor winter sports, so will they withstand that kind of wear and activity without tearing and ripping apart?

a:

Yes, these sets are built for durability and much use by kids. They will last a long time, even under the most adverse conditions.

Sources

  1. SickKids Staff, Dressing for the cold, Online Article
  2. Beth Turner, Winter Weather Safety Guide, Informative Article
  3. Kindercare, Online Article
  4. Gav Grayston, The Secret of Base Layers for Kids – Stay Warm when Out, Online Article