The all-time classic mid layer for warmth, the men's REI Co-op Teton fleece pants are great under shell pants on a cold hike—and even better worn on their own for comfy days in camp.

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Wear 'em under shell pants or on their own. The REI Co-op Teton fleece pants in men's short sizes are a classic mid layer for staying warm on cold hikes or around camp.

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Our go-to classic mid layer for warmth, the men's tall-size REI Co-op Teton fleece pants are great under shell pants on a cold hike—and even better worn on their own for comfy days in camp.

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The all-time classic mid layer for warmth under shell pants on a cold hike, the women's REI Co-op Teton fleece pants 2.0 are even better worn on their own for comfy days in camp.

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Layer them under shell pants for warmth on a cold hike, then shed the shell and kick back for comfort in camp with just the soft, petite women's REI Co-op Teton fleece pants 2.0.

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A layer of warmth under your shell pants that brings the fun back to a cold day on the trail, the women's REI Co-op Teton fleece pants 2.0 are also the classic base camp comfort pants.

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Coziness calls. Whether you're suiting up for an adventure or just looking forward to a day of lounging, the men's Marmot Three Pines joggers have you covered.

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Welcome to a new generation of running tights. The men's On Tights Long are warm enough for cool days and light enough for all-year wear—in essence, a true running essential.

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Warm enough for cool days, light enough for all-year wear, the On Tights Long deliver high stretch, low weight and a gentle compressive feel to your running and workout wardrobe.

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Rain in the forecast won't deter your outdoor plans when you have the women's Patagonia Torrentshell 3L pants. With 3-layer waterproofing, they're made for it—time and again.

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Swiss engineering elevates these classic warmup pants—the men's On Track pants—that make it easy to layer up and keep your training on track. Zonal mesh supplies ventilation where it's needed most.

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These high-quality tights are designed to take you from trail to town, and anywhere in between. Free Country Trail to Town tights have 4-way stretch fabric and a supportive high-rise waistband.

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Whether you need workwear pants for planting tomatoes, tuning your bike or DIY home projects, the Flylow Trail men's work pants are up for the job in a tough canvas with a soft, broken-in feel.

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Fit for movement and made with 100% recycled polyester, the camp-friendly REI Co-op Trailmade men's fleece pants are great as a standalone on cold days or under rain pants when it's coming down.

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