REI Co-op Midweight Base Layer Crew Top - Kids'
A thermal base layer that wicks for warmth, the kids' REI Co-op Midweight base layer crew top helps keep them comfortable for all-day exploring and adventuring in colder weather.
- Durable recycled polyester/spandex blend fabric is soft and sweat-wicking
- 257 g/m2 fabric weight offers midweight warmth
- UPF 50+ sun protection
- Designed to hug the body for optimum performance
- Soft, durable flatlock seams are smooth and comfortable
- Thumbholes for an always-in-place fit
- Size M (10–12) Kids has a weight of 6 oz. (169 g)
- Machine wash separately in cold, gentle cycle, remove promptly; do not use bleach or fabric softeners; tumble dry low
- Note: not intended for sleepwear
- Contains materials that meet the bluesign® criteria
- REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world
Imported.
View all REI Co-op Kids' Base Layer TopsBest Use | Multisport |
---|---|
Shirt Type | T-shirt |
Fabric | 87% recycled polyester/13% spandex (bluesign approved) |
Sun-Protective Fabric | Yes |
UPF Rating | 50 |
Moisture Wicking | Yes |
Underwear Weight | Midweight |
Sleeve Length | Long Sleeve |
Thumbholes | Yes |
Gender | Kids' |
Sustainability | Contains materials that meet the bluesign® criteria Contains recycled materials From a Climate Label Certified brand |
XXS | XS | S | M | L | XL | |
---|---|---|---|---|---|---|
Numerical Size | 5 | 6-7 | 8 | 10 | 12 | 14 |
Height Range | 45 | 47 1/2 - 50 | 52 | 57 | 61 1/2 | 65 1/2 |
Across Shoulder | 11 | 12 1/4 | 13 | 13 1/2 | 14 | 14 3/4 |
Chest | 23 | 24 - 25 | 26 - 27 | 28 - 29 1/2 | 30 1/2 - 31 1/2 | 32 - 33 |
Sleeve Length | 21 | 22 - 23 1/2 | 24 - 25 | 26 - 27 | 27 1/2 - 28 1/2 | 29 1/4 - 30 1/4 |
Waist | 21 1/4 | 22 - 23 | 24 - 25 | 26 - 27 | 27 1/2 - 28 1/2 | 28 3/4 - 29 3/4 |
Hip | 23 3/4 | 24 1/4 - 26 1/4 | 27 - 28 | 29 - 31 | 32 - 33 | 34 - 35 |
Inseam | 19 | 21 - 22 3/4 | 23 - 24 | 25 - 26 1/2 | 27 - 29 | 29 1/2 - 30 1/2 |
Sizing Notes
Measurements are stated in inches unless otherwise indicated. Size chart values represent body measurements, not garment measurements.
Inseam is measured to the floor.
Better gear is built together
From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.


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Customer Images
Comfortable and Warm
My son really likes this thermal as the only base layer under his ski jacket in 10-30 degree temperatures. He said it is comfortable, the right size, a good color, and the thumb holes are nice for helping to keep his hands warm under gloves.
Well done REI!
Soft, sturdy, warm. Fits great and is sturdier than most kids baselayer items
Great for cold weather!
Good quality. Fabric is a nice weight - soft and feels brushed on interior. My 7 year old is learning to ski and this set has kept her warm and dry.