

❄️ Gear Up, Stay Warm, and Never Miss a Snow Day!
Thermajohn Thermal Underwear for Kids is a high-performance base layer designed to keep boys warm, dry, and comfortable in cold weather. Featuring ultra-soft fleece lining, moisture-wicking polyester-spandex fabric, and 4-way stretch for mobility, this thermal set is perfect for skiing, snow play, or cozy indoor wear. Its slim fit and elastic waistband ensure a secure, comfortable fit that layers easily under winter clothes.



















| Care instructions | Machine Wash |
| Fabric type | 92% Polyester, 8% Spandex |
| Origin | Imported |
A**R
Comfy, great quality
I used these for my son who wanted to be a minion for Halloween. They were perfect! Bonus points for being extra warm. Then we used them as long John’s for when it snowed out. Would definitely purchase again. My son even slept in them as PJ’s so we definitely got our money worth from them.
D**F
No just for children
I purchased these in XL dark navy blue. I'm 107lbs female 5'5 And these fit great! The sleeve on the top feels a bit short but they do come to a comfortable place so that might just be a personal preference. They are extra soft. The opening in the bottoms is sewn closed which is perfect. I'm wearing them to bed as I type this and couldn't love them more. Color is great. Fit is perfect and I'm nice and warm. Win win win.
F**S
Great base layer (or PJ)
Soft, stretchy, comfortable. Great base layer under jeans, rain pants, T shirts, etc! Often my kids will wear these as Pajamas and then just get dressed in the morning by pulling their clothes ontop. Keeps them warm. Great quality and price
M**3
Perfect for cold weather
Got these for my kids to wear under tball uniforms. They kept them warm and were a great fit. They are super soft, the kids loved them and I would totally buy again. Great price for the set. Fabric was thick and soft on the inside. Perfect for layering, especially for sports when it’s kind of cold but not super cold.
A**)
Warm and cozy but pill
These are great they’re warm they fit perfectly but they do pill easily. Doesn’t bother me that much since they’re an under layer but it drives one of my kids crazy because they can feel it through the shirt. They’re very soft and hold up well in the washer without shrinking.
M**R
Very soft, high quality
Ordered two of these sets, one for each child. They are a nice weight, soft and thick but not bulky. they wore them skiing and stayed nice and warm. these are also easy to wash and dry. The fit is true to size but a bit on the small size so if your child is on the larger side of their size I would size up. The colors are also all very close to each other in shades of gray so it's hard to tell them apart even though we ordered different colors.
M**B
Makes great PJs
My kid loves these for PJs, he just said “100 gold stars” when I asked what to give them. These are thick and would be hot but little kids are cold easily. California fire rules have ruined PJ for kids with wide shoulders and solid bodies (my kid is fit and soild, average height but big skeleton and muscular for a kid - more football player than swimmers build). I don’t allow hanging out in underwear so you must have shirt and pants/ shorts on in the house. He does not want to keep his school clothes on. Pj are so slim they pinch his armpits and squeeze his legs. I know it is not just us because I have heard this complaint from others parents about PJ sizing being overly slim cut. He is a size 5 in clothes but I have to get at least an 8 or 10 in cotton PJs to fit his soildness but his legs are too short and the cuffs are bunched or rolled….. BUT long Johns fit like they should!!!! I also buy thin kinds of long johns (32 degrees brand) for when it is warmer months if he wants to hang out in the house in comfortable clothes. Hopefully California wont figure this out and force long johns to be tight.
D**K
Very soft and high quality
Purchased the XL (US size 11-12) for my 10 year old. They are slightly loose on him, but would fit as they should for an 11/12 year old. I was impressed with the thickness, and quality feel. Very soft on the inside. The double layer of fabrics is perfect for our northern Maine winters. I would not necessarily use them for hiking or fall temps. Very impressed. Buy them.
Trustpilot
1 day ago
1 month ago