Make your kiddo’s base layer the warm, breathable, kids’ REI Co-op Midweight Crew long underwear top and they’ll play happily outside all day. It’s great on its own for inside play, too.
Features
- Made of a durable yet soft polyester/spandex blend fabric that wicks sweat and dries fast
- Odor control treatment regenerates between launderings
- Flatseam construction, raglan sleeves and side gussets are comfortable as you move
- Extended back hem stays tucked in when you lean forward
- Thumbholes keep sleeves in place during play
- UPF 50 sun protection
- Made using bluesign®-approved materials, which conserve resources and protect the health of the environment, workers and wearer (your kid!)
- bluesign®-certified fabric; learn more about this sustainability standard at REI.com/stewardship
Imported.
Technical Specs
| Best Use |
Multisport |
|---|---|
| Shirt Type |
T-shirt |
| Fabric |
89% polyester/11% spandex (bluesign®-approved) |
| Sun-Protective Fabric |
Yes |
| UPF Rating |
50 |
| Moisture Wicking |
Yes |
| Quick Drying |
Yes |
| Underwear Weight |
Midweight |
| Sleeve Length |
Long Sleeve |
| Gender |
Kids’ |
| Sustainability |
Fair Trade Certified™ factory Contains materials that meet the bluesign® criteria |
Size Chart
| XXS | XS | S | M | L | XL | |
|---|---|---|---|---|---|---|
| Numerical Size | 4-5 | 6-7 | 8 | 10-12 | 14-16 | 18 |
| Height Range | 41-44 | 46.5-50.5 | 52.5 | 55.5-58.5 | 62.5-64 | 67 |
| Chest | 22-23 | 24-26 | 27 | 28.8-30 | 31.5-33.5 | 35.5 |
| Waist | 22-22.5 | 23-23.5 | 24.5 | 25.5-26.5 | 28-30 | 32 |
| Hip | 23-24 | 24-27.5 | 28.5 | 30-32 | 34-36 | 38 |
| Inseam | 17 – 18.75 | 20 – 23 | 24.5 | 25.5 – 27.5 | 30 – 31 | 31.5 |
Sizing Notes
Measurements are stated in inches unless otherwise indicated.



























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