REI Co-op Midweight Long Underwear Bottoms - Boys'
This product is not available. Good news: we have a newer version.
The soft and comfortable REI Midweight long underwear bottoms help keep your boy's legs warm when he ventures out to play in the snow or other cold-weather fun.
Shop newer version- Polyester fabric draws moisture away from the skin and dries quickly; peached finish creates a super soft feel
- With a UPF 50+ rating, fabric provides excellent protection against harmful ultraviolet rays
- Gusseted crotch; flat seams; elastic waist
- 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
| Best Use | Multisport |
|---|---|
| Fabric | 95% polyester/5% spandex |
| Sun-Protective Fabric | Yes |
| UPF Rating | 50 |
| Moisture Wicking | Yes |
| Quick Drying | Yes |
| Underwear Weight | Midweight |
| Inseam (in.) | 25.5 inches |
| Gender | Boys' |
| Sustainability | From a Climate Label Certified brand |
REI Co-op Clothing - Boys'
| XXS (4-5) Kids | XS (6-7) Kids | S (8) Kids | M (10-12) Kids | L (14-16) Kids | XL (18) Kids | |
|---|---|---|---|---|---|---|
| Numerical Size | 4 - 5 | 6 - 7 | 8 | 10 - 12 | 14 - 16 | 18 |
| Height Range | 41 - 44 | 46.5 - 49.5 | 52 | 55.5 - 58.5 | 62.5 - 64 | 67 |
| Chest | 22 - 23 | 24 - 25.5 | 26.5 | 27.5 - 28.5 | 30.5 - 32 | 33.5 |
| Waist | 22 - 22.5 | 23 - 23.5 | 24.5 | 25.5 - 26.5 | 28 - 29.5 | 31 |
| Hip | 21 - 23 | 25 - 26.5 | 27 | 28 - 29 | 30.5 - 32 | 33.5 |
| 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. Size chart values represent body measurements, not garment measurements.
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.
