Trail runners in Smartwool wool running clothes


Merino Wool Running Clothes


Made for the road, trail, and every scramble in between.

Over muddy switchbacks or under redwood canopies, wherever the trail leads, our Merino running clothes are happy to follow. Like you, they live for adventure and can’t wait for the next trail. But when a mile 5-mile loop turns into a 10-mile detour, the last thing you want to think is what you’re wearing. That’s why our wool running apparel features no-chafe seams and shorts with odor-resisting Merino liners. Because when you’re comfortable, you can focus on what really matters. Like finding the car. 


Couple wearing running clothes from Smartwool
PhD Running clothes with mesh zones for breathability & moisture management


Smartwool PhD® Thermal Body Mapping Technology: Understanding the body in motion.


Body mapping shows that sweat isn’t gender neutral. And comfort creates efficiency. That’s why we address men’s and women’s bodies differently, zone by zone. Body mapping technology allows us to put the right amount of breathability and warmth where you need it most. That means details like mesh panels on Smartwool® PhD® tops where men sweat the most and women’s-specific breathability zones on PhD® socks. It all adds up to serious comfort, making you more efficient over the long haul.

Meet the World's Best Run Sock:  Gender specific venting keeps you cool; Reliawool™ Technology in high impact zones; 4 Degree Elite™ fit system for a dialed fit


Meet the World’s Best Wool Running Socks


When it comes to running socks, we believe that good enough is never good enough. Our PhD® running sock collection is 20 years, thousands of prototypes and millions of miles in the making.  

Our athletes and fan field testers put our wool running socks to the test all over the world on every type of terrain, from rugged mountain trails to road marathons, so we know what runners need. Smartwool running socks come in a variety of heights and levels of cushioning, including wool compression socks for running. Our wool running sock technology includes features like gender-specific fit and mesh zones for ultimate breathability. With the 4 Degree® elite fit system for a dialed fit and the moisture-wicking benefits of premium Merino wool, our socks deliver more comfort over more miles.

Chart that shows wool running socks available in different heights and cushioning