Features:

  • Comfort Driven Design: The fibers we use in Thermajohn’s boy’s thermals are woven with oil which makes the boy’s long johns super soft. There are no tags and the seams are positioned to reduce friction.
  • Premier Quality Fabric: All kid’s thermal are made of a lightweight material of 92% Polyester/8% Spandex and are machine washable. Your kids can wear them while doing any activity.
  • Anti-Odor: Cross knitted fibers make these boy’s long johns thermal sets naturally breathable and moisture-wicking. They keep your kid dry and the Moisture Transport System sweeps away any odor.
  • Performance: Your child needs freedom of movement. Our kid’s long underwear are made of a four-way stretch design that enhances your child’s range of motion and allows them to move freely in any direction.
  • NO QUESTIONS ASKED 100% SATISFACTION GUARANTEED ThermalJBrands Certified Guaranteed If you are not satisfied for any reason, Simply Return Them Without Questions Within 30-Days. It is that simple, Select Your Favorite Color and "Add to Cart" now
Comfy and warm, wrong sizing

This is very soft and comfy according to my son and warm. I washed them as soon as I received them and they didn't shrink or create lint. I had originally ordered a medium, based on the product sizing but it was very small and I had to return it and order a bigger one. Delivery was very fast on both occasions. My son is 6, tall and muscular. He's 4'4" (52") and 69lb. He usually wears Youth Small to Medium in major brands. Medium was more like 5T. The XL fits perfectly but will be small next winter.

Never hear "I'm cold!" with these, money well-spent!

Bright colors and large selection helped on our mountain trip at Christmas, so I could get a different color for each of my kids. They never once complained about being cold with these on! In fact, my younger two didn't even want to take them off! This brand makes very cozy thermal underwear, the fleecing makes it feel like they're hugging you without feeling constricting or too hot. 5/5 stars for quality, value, selection, and coziness. I bought sets for our whole family and would 100% but them again!

Soft and comfortable

The size xs fit good for my 4years old, 55bls, 46 inches. He was comfortable, soft material and keep him warm in 9 deegree winter. Thumb up

These are the thermals that you're looking for!

My son loves these! I got them for him to wear under his snow gear, but he wears them all the time as pjs. Very comfortable and soft on the inside, but still fitted like you want for long underwear. Will be buying again and again.

Did the job

Bought it for my son that played soccer in cold weather. Worked great and kept his legs and upper body warm

4 year old loves them

I bought these in size XS for my average size almost-five year old boy, and the arms and legs are long on him as I expected they would be, but they fit so snugly it won't matter and he will just be able to wear them all the longer. I had him try them on right away to check the size, and he loved the feel of them so much he didn't want to take them off. I anticipate these will be a big help in keeping him cozy during outdoor activities here in upstate NY.

Comfortable, warm and accurate sizing

My son wore these as a base layer for a 4 hour horseback riding event. It was 40 degrees outside with a slight breeze and he said they were comfortable to move around in and kept him warm, but not too hot. I plan on buying a second pair.

Quality kids baselayers for a great price!

My son lives in these baselayers! Warm, stretchy, cozy and soft. So far all sets have washed well with no pilling and the fleece lining has stayed soft. Easily comparable to more expensive brands without breaking the bank for growing kiddos.

My son loves them!

These are super comfortable for my ten year old son he is pretty tall. I got an extra large and it fit great. He is super sensitive to fabrics and can't stand the feel of certain types, but he loved the fabric of these. Thank goodness, lol. Super soft on the inside and will def be a great extra layer in the winter!

Very nice long underwear!

I bought these for my grandson. He absolutely loves them; however, they do seem to run a bit on the small side. He's fairly tall for his age, so we returned them for the next size up. Problem solved.

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