REI Co-op Merino Midweight Base Layer Bottoms - Kids'
Offering wooly warmth for cold days, the kids' REI Co-op Merino Midweight base layer bottoms are soft—not scratchy—and naturally regulate body temperature for comfort on the move.
- Ultrafine, pill-resistant 185 g/m2 merino wool offers a soft feel without the scratchiness
- Made with 100% merino wool that naturally wicks away sweat, resists odors and dries quickly
- UPF 30 sun protection
- Low-profile waistband and crotch gusset keep kids comfortable as they move
- Flat seams eliminate chafing
- Size S Kids has an inseam length of 22 in.
- Size M (10–12) Kids has a weight of 4.2 oz. (120 g)
- Machine wash warm, gentle cycle, use wool wash product, do not twist or wring, remove promptly; do not bleach; tumble dry low
- Note: not intended for sleepwear
- Made in a Fair Trade Certified™ factory
- 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 BottomsBest Use | Multisport |
---|---|
Fabric | 100% merino wool |
Sun-Protective Fabric | Yes |
UPF Rating | 30 |
Moisture Wicking | Yes |
Quick Drying | Yes |
Underwear Weight | Midweight |
Inseam (in.) | 22 inches |
Gender | Kids' |
Sustainability | Fair Trade Certified™ factory 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.

