Start layering your littles with the kids’ warm, breathable REI Co-op Lightweight Crew Long Underwear top. It features a made-to-move design and all of the comfy for a day of play.
Features
- Polyester/spandex blend fabric is soft, fast drying and sweat-wicking
- Odor-control treatment regenerates between laundry days
- Thumbholes keep hands covered and sleeves in place
- Soft, durable seams are smooth to the touch
- UPF 50 sun protection
- Made using bluesign®-approved materials, which conserve resources and protect the health of the environment, workers and wearer (your kid!)
Imported.
Technical Specs
| Best Use |
Multisport |
|---|---|
| Shirt Type |
T-shirt |
| Fabric |
82% polyester/18% spandex (bluesign®-approved) |
| Sun-Protective Fabric |
Yes |
| UPF Rating |
50 |
| Moisture Wicking |
Yes |
| Quick Drying |
Yes |
| Underwear Weight |
Lightweight |
| 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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