Soft, breathable and naturally odor resistant, the ultrafine merino wool of the men's REI Co-op Merino 185 long-sleeve base layer top is beloved while sweating on the trail—and sleeping in the tent.

base-layer-tops

Soft, breathable and naturally odor resistant, the ultrafine merino wool of the men's REI Co-op Merino 185 long-sleeve base layer top is beloved for both sweating on the trail and just sleeping.

base-layer-tops

Soft and breathable, the ultrafine merino wool of the naturally odor-resistant men's REI Co-op Merino 185 long-sleeve half-zip base layer top is ideal for sweating on the trail—and sleeping in a tent.

base-layer-tops

The ultrafine merino wool of the men's REI Co-op Merino 185 long-sleeve half-zip base layer top is an ideal soft, breathable, odor-resistant layer for sweating on the trail—and sleeping in a tent.

base-layer-tops

Built with soft merino, the Icebreaker Merino 200 Sonebula Long-Sleeve High-Neck Thermal top regulates body temperature in all weather conditions while resisting odors. High collar adds coverage.

base-layer-tops

Stay dry on the trail in the soft, breathable and naturally odor-resistant REI Co-op Merino Boxer Brief Underwear for men. They're made to keep you comfy throughout the day.

boxers

Stay dry on the trail in the soft, breathable and naturally odor-resistant REI Co-op Merino Boxers for men. They're made to keep you comfy throughout the day.

boxers

A naturally technical fiber, merino wool resists odors and regulates temps, making the men's On Merino Long-T shirt an outdoor essential at any time of year—it's perfect for hiking and everyday wear.

hiking-shirts

Your underwear should deliver lasting comfort. Whether you're spending the day at work or a couple hours at the gym, Smartwool Merino Plant-Based Dye boxer briefs help you stay confidently comfy.

boxers

A wide, merino-lined elastic waistband and flatlock seams help make Smartwool Merino Print boxer briefs your new favorite for any activity—from urban exploration to new trail adventures.

boxers

For your next round of golf or a coffee meetup with friends, grab a pair of the men's Smartwool Merino 10 in. shorts a snappy look that's functional and comfortable as well.

casual-shorts

A great tee for gym sessions, pavement loops and trail quests, the men's Smartwool Merino Sport 120 T-shirt delivers cooling comfort however you're working up a sweat.

t-shirts

Primed for summertime date nights or movies in the park, the men's Smartwool Merino 10 in. shorts offer a snappy look that's functional and comfortable as well.

casual-shorts

Run down your training goals in the men's Smartwool Merino Sport fleece tights. They have a cozy merino wool interior and a durable synthetic exterior to fend off the elements while you crush PRs.

running-tights