Naturally technical, merino wool regulates temps and resists odors, making the women's On Merino Long-T shirt an outdoor essential at any time of year—it's perfect for hiking and everyday wear.

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Purpose-built for comfort that lasts all day, the women's Smartwool Merino Plant-Based Dye T-shirt is versatile enough to be worn on its own or with weather-appropriate layers.

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A great tee for gym sessions, pavement loops and trail quests, the men's Smartwool Merino Sport 120 T-shirt delivers cooling comfort however you're working up a sweat.

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Made for the times when you break a sweat in cool temps—did someone say a fall hike or early spring mountain bike ride?—the men's Smartwool Merino Sport hoodie keeps you feeling comfortable and fresh.

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A long-sleeved tee that works with you as you move, the Smartwool Merino Sport Logo Graphic tee helps with thermoregulation, odor control, dry times and durability so you can keep up the intensity.

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Feel great in cool- to warm-weather activities with the Smartwool Merino Sport long-sleeve quarter zip. Its merino/polyester fabric blend offers odor control, temperature regulation and durability.

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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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Great for sweaty training runs or trail hikes, the women's Smartwool Merino Sport Ultralite Hoodie has a lightweight, natural softness that makes it an excellent option no matter what your day holds.

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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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As the clouds part and the sun shines on through, the women's Free Country Microtech Chill B Cool T-shirt keeps your comfort top on mind with an ultrasoft feel and 4-way stretch.

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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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