Rocky Thermal Underwear for Kids, Boys Thermals, Long Johns Underwear, Base Layer for Cold Weather/Skiing
Product ID: 399624567
💧Moisture-wicking fleece lining
🔥Superior warmth retention
🧵Durable poly-spandex blend
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❄️ Keep your little adventurer warm, dry, and unstoppable this winter!
Rocky Thermal Underwear for Kids offers a lightweight yet highly durable base layer crafted from a 90% polyester and 10% spandex blend. Designed with a stay-put fit and ultra-soft fleece lining, it delivers superior warmth and moisture-wicking performance for cold weather and skiing. Machine washable and built to endure, this set is the #1 boys' thermal underwear on the market, combining comfort and resilience for everyday winter wear.
| ASIN | B09NB2VPQ4 |
| Age Range Description | Little Kid |
| Apparel Closure Type | Pull On |
| Apparel Fabric Stretch | Medium Stretch |
| Apparel Fabric Weight Class | Lightweight |
| Best Sellers Rank | #49,457 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #1 in Boys' Thermal Underwear Sets |
| Brand Name | Rocky |
| Care instructions | Machine Wash |
| Collection Name | Rocky |
| Color | White |
| Customer Reviews | 4.6 out of 5 stars 5,441 Reviews |
| Fabric Type | 90% Polyester, 10% Spandex |
| Fabric type | 90% Polyester, 10% Spandex |
| Fit Type | Regular |
| Fit to Size Sentiment | Fits as expected |
| Garment Size Country | United States |
| Global Trade Identification Number | 00810065353566 |
| Import Designation | Made in the USA and Imported |
| Manufacturer Part Number | 85WXS - New Label |
| Material Type | Polyester Blend |
| Neck Style | Crew Neck |
| Number of Items | 2 |
| Occasion Type | Everyday |
| Origin | Made in the USA and Imported |
| Pattern | Solid |
| Product Care Instructions | Machine Wash |
| Size | X-Small |
| Sleeve Length Description | Long Sleeve |
| Sleeve Type | Long Sleeve |
| Style Name | Snug |
| Style Number | 85WXS - New Label |
| Unit Count | 1 Set |
M**Z
Great purchase
Great fit - my son loves them and I love them because they keep him warm!
V**V
Cozy for winters
So warm and cozy, my son loves it. Great to wear as a base layer in the winter. My son loved it so much I had to buy another. Yes, it does pill. But i think it's because the fabric is thin. Serves our purpose well.
S**A
Breathable, fun design, comfortable
Good fitting, kept my grandson warm while playing in the blizzard of 2026.
L**E
Super soft and warm
Super soft and warm and the fit is just right
S**T
Great thermals!
I got these for my son who’s 4- he wears them under his rain and snow gear at nature school all day and it seems to keep him much warmer and more comfortable than regular shirts and sweats. I didn’t notice any shrinkage but I have found that they pill quite a bit especially when used as under clothes. The patterns were exactly as they were advertised and the size guide seemed to be great gage of what to purchase!
C**Y
They fit well and the kids like them.
Bought these for my nephews for both layering pieces and winter pajamas. The kiddos like how soft they feel and they wear them all the time.
R**I
Comfort and warmth in style!
Very soft and comfortable; fun styles.
A**R
Fitting
I like it
K**E
Muy buena compra
Ligero y muy suave
R**N
Good quality
Bought this set for my son to wear under his soccer uniform. He says it’s very comfy and did a great job at keeping him warm and dry while playing in the rain without getting too sweaty. Washed well. Would buy again. We bought a size up and it fits him well with a little room to grow. If your child is tall or a heavier build, buy the size up.
K**O
Postage doubles the cost of the purchase price.
Does not feel warm, lining gives clammy feel.
R**.
Perfect for Skating and Sports
My son loves these, they are light and breathable, yet warm. The material is exceptional, and so far has not shrank. My child uses these for skating and hockey. We used to layer up with pajama pants, but this is much better. Coincidentally, these can also be used as pajamas. * They are comfortable. * They are breathable. * They do not shrink.
B**S
Comfortable for hockey
I bought these for my son to wear under his hockey equipment and overall they are good. The fabric is soft and has a decent amount of stretch. He finds them comfortable and they keep the sweat off his skin. However, I've already had to sew up two seams in the pants. The first hole appeared after the first wear and wash and a second after about 6 wears.
Trustpilot
3 days ago
2 weeks ago