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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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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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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Moisture-wicking and quick-drying, the men's REI Co-op Active Pursuits long-sleeve T-shirt protects you from morning chill, midday sun and trailside brambles.

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With a new softer feel, the men's REI Co-op Active Pursuits 2.0 quarter-zip shirt is ideal for cool-weather workouts: warm before and after; breathable and wicking so you don't overheat during.

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Daydreaming about summer days on the trail? Include the REI Co-op Active Pursuits T-Shirt and imagine yourself staying supremely cool and comfortable on those sunny switchbacks.

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The months of early morning runs and cross-training have paid off—now that you're toeing the starting line, it's time to kick into high gear in the moisture-wicking adidas Adizero T-shirt.

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Head off-road for a quick hike and then head back into town in comfort and confidence in the men's Marmot Aerobora shirt. Its heathered slubbed fabric breathes well and dries fast.

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The men's Mountain Hardwear Air Mesh Half-Zip pullover may look unassuming, but once you have it on, you won't need anything else. Its active mesh fabric keeps you comfortable in a variety of temps.

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Offering coverage on desert multi-pitches, high-alpine approaches and hot crag sessions, the men's Black Diamond Alpenglow long-sleeve crew shirt fends off sun, sweat and overheating.

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A go-to for urban outings, far-flung travels and trail adventures, this men's Outdoor Research Astroman long-sleeve sun shirt keeps you moving with easy stretch and UPF 50+ sun protection.

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Sunny crag days get a little bit better in this button-up. With built-in UPF 50+ sun protection, the men's Outdoor Research Astroman sun shirt protects you from harsh rays while on the wall.

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There's a reason it's a bestseller. The men's Outdoor Research Astroman technical sun shirt delivers UPF 50+ protection and ultimate stretch for all your trail and urban outings and travel adventures.

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