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

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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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Made to move, the women's On Active tank top boasts lightweight, moisture-managing fabrics and a neat but unrestrictive cut. Wear it to stretch, jog, lift, hike—or however else you like to get moving.

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With a soft, performance fabric blend of merino wool and TENCEL™ lyocell, the Smartwool Active Ultralite High-Neck tank top is primed for an intense workout but is also suitable for everyday wear.

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You can work up a sweat and still feel cool with the women's Smartwool Active Ultralite long-sleeve T-shirt. With its soft, lightweight and comfy feel, this top is great for high-energy activities.

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Designed to help you stay cool and comfortable when you work up a sweat, the women's Smartwool Active Ultralite Racerback tank top is ready for wherever your workout takes you—gym, roads or trails.

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Keep things breezy in the summer with the women's Smartwool Active Ultralite V-neck T-shirt. Great for trail hikes and yoga classes, it's light, soft and built to keep you cool.

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Built with bestselling ActiveIce™ technology, the women's Outdoor Research ActiveIce Spectrum Sun long-sleeve tee helps keeps you cool and protected in hot, sweaty, sun-baked conditions.

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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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An advanced bike jersey with wind-protective fabric up front and mesh on the back to keep you cool and dry on intense MTB and gravel rides, the Craft Adv Bike Offroad T-shirt offers a loose fit.

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Made of soft and stretchy fabric offering excellent moisture transport during intense rides, the Craft Adv Endur cycling jersey has 4 back pockets and body-mapped mesh panels for enhanced ventilation.

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