REI Co-op Lightweight Base Layer Bottoms - Kids'
Get your little sidekick dressed for adventure with the REI Co-op Lightweight base layer bottoms for kids. Designed for warmth, these bottoms are easy to pull on and great for layering.
- Recycled polyester/spandex printed jersey fabric is soft and sweat-wicking
- 200 g/m2 fabric weight offers lightweight warmth
- UPF 50+ sun protection
- Low-profile waistband keeps kids comfortable as they move
- Designed to hug the body for optimum performance
- Soft, durable flatlock seams are smooth and comfortable
- Size S Kids has an inseam length of 21.75 in.
- Size M (10–12) Kids has a weight of 4.2 oz. (120 g)
- Machine wash cold, gentle cycle; do not use bleach or fabric softeners; tumble dry low
- Note: not intended for sleepwear
- 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
- Contains materials that meet the bluesign® criteria
Imported.
View all REI Co-op Kids' Base Layer BottomsBest Use | Multisport |
---|---|
Fabric | 82% recycled polyester/18% spandex (bluesign approved) |
Sun-Protective Fabric | Yes |
UPF Rating | 50+ |
Moisture Wicking | Yes |
Underwear Weight | Lightweight |
Inseam (in.) | 21.75 inches |
Gender | Kids' |
Sustainability | Contains recycled materials Contains materials that meet the bluesign® criteria 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.

