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

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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.

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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.

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Move with ease and layer to your heart's content with the the low-impact REI Co-op Merino Bralette, made with a sweat-wicking merino wool blend and ready for the day ahead.

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

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Ideal for cold weather, the kids' REI Co-op merino midweight base layer bottoms are soft—not scratchy—naturally regulate temp and made with wool that's certified to the Responsible Wool Standard.

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Oh so soft and not itchy, the kids' REI Co-op merino midweight base layer top is an ideal first layer for cold weather. It naturally regulates temp and is certified to the Responsible Wool Standard.

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Avoid panty lines on the trail in the soft, breathable and naturally odor-resistant REI Co-op Merino Merino Thong Underwear for women. They're made to keep you comfy throughout the day.

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Hike cold, snowy trails with confidence in the REI Co-op Expedition Merino Hiking crew socks. Their thick cushioning keeps feet warm and the wool blend is naturally breathable and odor-resistant.

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The REI Co-op Merino Wool Lightweight Flash Crew Socks are our most popular summer-weight hiking socks for good reason—they're naturally breathable, sweat wicking, quick drying and odor resistant.

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The REI Co-op Merino Wool Lightweight Flash Quarter Socks are our most popular summer-weight hiking socks for good reason—they're naturally breathable, sweat wicking, quick drying and odor resistant.

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The REI Co-op Merino Wool Lightweight hiking crew socks are our most popular summer-weight hiking socks for good reason—they're naturally breathable, sweat wicking, quick-drying and odor-resistant.

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Bare a little more skin for a little cooler hike with the REI Co-op Merino Wool Lightweight hiking quarter socks. Naturally breathable, moisture-wicking and odor-resistant, they cushion every step

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Wear 'em under your hiking socks to reduce friction on multiday trips, or wear 'em alone for summer day hikes. The REI Co-op Merino Wool liner socks put a layer of comfort between you and the trail.

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