

❄️ 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.



















| ASIN | B0D7JPB1J4 |
| Age Range Description | Big Kid |
| Apparel Closure Type | Pull On |
| Best Sellers Rank | #126,198 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #23 in Boys' Thermal Underwear Sets |
| Brand Name | Thermajohn |
| Care instructions | Machine Wash |
| Collection Name | Winter |
| Color | Black and White |
| Customer Reviews | 4.6 out of 5 stars 2,842 Reviews |
| Fabric Type | 92% Polyester, 8% Spandex |
| Fabric type | 92% Polyester, 8% Spandex |
| Fit Type | Stretch |
| Global Trade Identification Number | 00810121586396 |
| Item Type Name | Base Layer Set |
| Item Weight | 236.9 Grams |
| Manufacturer | Thermajohn |
| Material Type | Polyester |
| Neck Style | Crew Neck |
| Number of Items | 2 |
| Origin | Imported |
| Package Quantity | 2 |
| Pattern | Solid |
| Product Care Instructions | Machine Wash |
| Size | Medium |
| Sleeve Type | Long Sleeve |
| Style Name | Set - Tops |
| Style Number | J-T-B-1836 |
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.
P**K
SOFTEST best thermals ever!
My son’s favorite thermals. He is 4 years old and says “ohhhhh so cozy” every time he steps into them. I saw reviews that they run large and are often returned for that reason but I find the larger sizing perfect for kids so they can grow into them. They still fit great even if a little bigger. My son wore them last year and he still fits into them great this winter so I actually think it’s a plus for the sizing to run large. I’m having a hard time finding more to buy on Amazon so hopefully they’ll consider making more!!
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.
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.
M**A
Warm Baselayer
Sizing is off, pants are so long! But it’s warm and will fit for a few more winters
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
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.
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.
Trustpilot
1 week ago
2 months ago