These heavyweight REI Co-op base layer bottoms are made with 100% merino wool that wicks sweat and dries fast, offering a soft feel without the scratchiness. The 250 g/m² merino wool provides warmth for cold-weather adventures while naturally resisting odors.
Designed for multisport use, they feature a soft jacquard waistband that is comfortable on the skin and low profile for easy layering, a crotch gusset for ease of movement, and a functional fly. The close-to-body fit delivers optimum performance, and a locker loop makes it easy to hang them to dry or keep them off the ground. Inseam length: 29 in. (73.7 cm); Tall sizes: 32 in. (81.3 cm). Machine wash cold, use wool wash product, do not twist or wring, remove promptly; do not bleach; tumble dry low. Made in a Fair Trade Certified™ factory.
Key Features
Best Use
Multisport
Fabric
100% merino wool
Sun-Protective Fabric
Yes
UPF Rating
50+
Moisture Wicking
Yes
Quick Drying
Yes
Fly Opening
Yes
Underwear Weight
Heavyweight
Inseam (in.)
29, 32 inches
Gender
Men's
Sustainability
Fair Trade Certified™ Factory - From a Climate Label Certified brand
Highlights
Heavyweight 250 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 50+ sun protection
Soft jacquard waistband is comfortable on the skin—and its low profile allows for easy layering
Crotch gusset is made for ease of movement
Functional fly
Close-to-body fit for optimum performance
Locker loop makes it easy to hang these to dry or just keep them off the ground
Inseam length: 29 in.; Tall sizes: 32 in.
Weight for size M: 8.8 oz. (250 g)
Machine wash cold, use wool wash product, do not twist or wring, remove promptly; do not bleach; tumble dry low
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
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.
