Lightweight and long-lasting, the men's Ortovox 120 Cool Tec Fast Upward T-shirt has a self-cooling effect and robust construction to help you keep up the pace on mountain terrain.

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Don't get slowed down at the crag! Comfortable, cool and quick-drying, the men's Ortovox 170 Cool Vertical T-shirt has a casual cut for optimum freedom of movement for those athletic moves.

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All the trail gear you need for 85 years and counting—show your love while you're out and about in this short-sleeve REI Co-op 1938 graphic T-shirt, which celebrates the year REI Co-op was founded.

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All the trail gear you need for 85 years and counting—now even your kiddo can celebrate the history of the co-op in this short-sleeve REI Co-op 1938 graphic T-shirt.

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Serving up heritage styling and warm-weather comfort, the men's Fjallraven 1960 Logo T-shirt is a lightweight, quick-drying staple for everyday adventures.

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Styled like your favorite concert tee, the women's Parks Project 1963 National Parks Tour T-shirt celebrates the national parks that existed in 1963.

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Soft, lightweight and made from organically grown cotton, this men's Patagonia 73 Skyline Regenerative Organic Pilot Cotton T-shirt is a tee you can feel extra-good about.

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Made for intense workouts in cold conditions, the Craft ADV SubZ Wool long-sleeve T-shirt 2 blends wool for warmth with polyester for transporting moisture when you're working up a sweat.

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At the beach, at camp, on a hike or in the virtual office, the Outdoor Research Aberdeen long-sleeve shirt is a comfortable, midweight layer that looks great and keeps you warm.

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This convenient garment is made for trekking and outdoor life in the summer. Plus, the men's Fjallraven Abisko Hike shirt is super packable, so it's practical when space is limited.

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An ideal first layer for any weather, the women's Fjallraven Abisko Wool shirt thermoregulates and breathes easy. Made with odor-resistant merino wool, it helps you feel fresh on multiday hikes.

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From 5k to ultra, the men's RaidLight Activ Run Zip T-shirt is a great lightweight choice for all types of running and all distances.

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The men's REI Co-op Active Pursuits half-zip shirt stretches four ways for easy mobility on the trail, and offers breathable warmth for comfortable lounging after your run.

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Breathable warmth and 4-way stretch make the women's REI Co-op Active Pursuits insulated pullover a natural for cool-morning running—and whatever else comes next in your day.

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