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.

hiking-shirts

From your first mile on the trail to your final push to the summit, Smartwool Merino Sport Lined shorts with a 5 in. inseam provide support, dry quickly and help regulate body temperature.

running-shorts

Finally, you've found a pair of shorts that'll keep up with you from the moment you put them on and through to the celebratory cheers at the finish. Meet the men's Smartwool Merino Sport lined shorts.

running-shorts

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.

t-shirts

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.

hiking-shirts

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.

hiking-shirts

Built with the outdoor enthusiast in mind, the men's Smartwool Merino Sport long-sleeve quarter-zip top provides thermoregulation, odor resistance and durability for years of adventure.

base-layer-tops

Ready for a day at the office or an afternoon out with friends, the women's Smartwool Merino Sport shirt dress is a long button-down made with stretch-woven fabric and breathable side panels.

dresses

Made in a supersoft merino wool and TENCEL™ lyocell blend performance fabric, the Smartwool Active Ultralite High-Neck tank top is primed for intense workouts while also being suitable for daily wear.

tank-tops

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.

t-shirts

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.

hiking-shirts

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.

hiking-shirts

Thanks to its breathable and temperature-regulating merino wool-blend jersey construction, the Smartwool Merino women's scoop-neck tank top is game for any adventure, any time of year.

tank-tops

Avoid panty lines on the trail in the soft, breathable and naturally odor-resistant REI Co-op Merino Merino Thong Underwear for women. They're made to keep you comfy throughout the day.

briefs