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ROCKY Thermal Underwear for Kids offers a premium 2-pack of fleece-lined long johns designed to stay put under heavy winter layers. Engineered with moisture-wicking poly-spandex fabric and reinforced stitching, these thermals provide all-day warmth and durability. Perfect for cold weather and skiing, they combine kid-friendly softness with technical performance to keep boys cozy, dry, and ready for any winter adventure.

























































| ASIN | B0FHSLHMG6 |
| Best Sellers Rank | #636,670 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #125 in Boys' Thermal Underwear Sets |
| Customer Reviews | 4.7 4.7 out of 5 stars (44) |
| Date First Available | July 16, 2025 |
| Department | boys |
R**A
My son loves
So my son doesn't like wearing underwear but you know he needs like something under. So we came to an agreement and he got to choose which ones he likes and how many. He got this one and one other from this seller. It was a little big but that's okay. He is a tall boy. He will grow into them. It is great quality. Very colorful
J**T
True to size
Five year old twins love these on cold Chicago nights
V**N
Great for layering!
Our twelve year old son really loved the two pair we purchased for him.
A**R
Great stretch
Be aware of the size! Bought the XS for my 38 lb. - 4y for a ski trip but ended up wearing them myself. (155 lb. 5'7") Needless to say they have great elasticity & they were comfy cozy & warm.
M**N
Protecting things of value
that they keep my grandson warm
P**I
Lovely product overall
Loved the fabric, comfort and tge coziness
V**R
Reliable warmth over the years
As a long-time purchaser of Rocky Thermal Underwear, I've found them to be a dependable choice for winter warmth. Over the past several years, I've invested in at least 12 sets for my son, and they've consistently delivered in terms of comfort and insulation. One of the standout features is their remarkable warmth, which keeps my son cozy throughout the New England winter. The comfort level is equally impressive, making them ideal for extended wear. He even wears them as pajamas. The fit has been consistent across purchases, so sizing isn't a problem. Despite frequent use and washing, they have retained their thickness, maintaining their effectiveness at keeping my son warm. Remarkably, none have worn out, even with heavy usage. I did deduct one star due to a recent batch exhibiting pilling issues. While still functional and warm, the appearance of pills (after only a few washes) is a noticeable departure from earlier purchases, which did not exhibit this problem. Despite this minor flaw, Rocky Thermal Underwear remains a reliable choice for winter wear, offering consistent warmth and comfort year after year.
R**Y
I must not have read the description
Very disappointed. I wanted a thermal underwear for my kiddo. Nope. This is not it. I don't even think it would keep him warm. The only "warmth" comes from a minky lining. Otherwise it's a poor fabric. I found what I wanted for a fourth of the price at Walmart. But the patterns are cute.
A**R
Seem to be well made and comfortable. A little on the larger side.
Trustpilot
3 weeks ago
3 weeks ago