With vertical color blocks and an athletic fit, the men's Smartwool Merino Sport long-sleeve crew is a sharp and practical top to wear when diving into your mild-weather outdoor activities.

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Vertical color blocks and an athletic fit make the men's Smartwool Merino Sport long-sleeve crew a sharp and practical top to wear when diving into your mild-weather outdoor activities.

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The athletic fit of the Smartwool Merino Sport Ultralite long sleeve complements the movements of your body, while the merino wool fabric blend helps you feel cool even as your activity intensifies.

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Great for hiking and everyday wear, the men's On Merino T-shirt has thermoregulating and antimicrobial properties that make it a wardrobe staple for year-round outdoor activities.

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Layer up in classic flannel warmth with a color-pop twist in the men's Cotopaxi Mero Flannel shirt. A heavyweight with a soft hand, it can be worn alone or layered over your favorite tee.

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Ready to ride or chill, the men's PEARL iZUMi Midland Graphic T-shirt is a comfortable, fast-drying technical tee made from a soft fabric knit with recycled polyester fibers.

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Cool and breathable with a relaxed, easy fit that won't slow you down, the men's Nike Miler shirt has got you covered for everything from easy jogs around the block to challenging workouts at the gym.

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Designed for maximum freedom of movement and plenty of airflow, the men's 2XU Motion T-shirt helps you stay cool and focused during tough workouts.

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Delivering the fit and fabric performance you need for tough hikes, gnarly trail runs and hard workouts, the men's Arc'teryx Motus SL Crew long-sleeve shirt wicks moisture and moves with your body.

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Perfect for any national park lovers, the Parks Project Mountain Bear Pocket T-shirt is a soft, midweight top that is great for year-round wear, whether you layer it or wear it solo.

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A go-to layer for skinning up tracks or pedaling a fat-tire bike at your local snow park, the Mountain Hardwear Mountain Stretch Half-Zip shirt boasts technical performance and an active fit.

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Between a shirt and a jacket, the men's Marmot Movatn Heavyweight Flannel long-sleeve shirt works as your outer layer post-sunset or part of your kit on colder days.

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Featuring moisture-wicking and warming technology, the men's New Balance NB Heat Grid half-zip top will help you to stay comfortable and focused on your workout, not the conditions.

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Whether you're visiting them all or checking off parks close to home, keep track with a Parks Project National Park Checklist T-shirt, a vintage-inspired unisex tee that's perfect for any park lover.

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