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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With the men's Smartwool Thermal Merino Jogger bottoms in your drawer, you'll be hoping for more cold-weather weekends. The merino wool next to skin offers thumbs-up comfort when it's time to move.

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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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Lightweight summer hiking pants made for sunny adventures, Helly Hansen Tinden Light hiking pants feature an articulated cut, a crotch gusset and 4-way stretch for maximum freedom of movement.

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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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The men's Outdoor Afro + REI Co-op Trail Pants pay homage to a legendary style made modern with added comfort. Tackle trails, hit the streets and simply move—all in a day's work.

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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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These joggers take on any rocky adventure—with water repellency, nylon/spandex for stretch and room to stow essentials, the men's REI Co-op Trailmade Joggers are ready for camp and beyond.

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The men's REI Co-op Trailmade pants give you the kind of durability made for the trail. Trek confidently with abrasion and tear resistance, cargo storage and light stretch for comfort and ease.

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Waterproof, breathable and constructed to freely move with you, the men's REI Co-op Trailmade rain pants allow you to sneak out to recharge on the trail, even when the rain clouds are gathering.

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