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The underwear you didn’t know you needed.

While underwear may be the last layer on your mind, it is the most important one you put on. So, make sure it’s Merino. Our new underwear offers the natural benefits and versatility of Merino, so you can layer on and take on any warm–weather activity comfortably.
We make our gear to support your adventures. So if, for any reason, you aren't completely happy with your Smartwool® products within two years of purchasing, we'll get you into some new gear.
*Free Three-Day Shipping valid on orders $75+ on Shipping based on normal carrier restrictions and delays, we cannot guarantee arrival. Free and easy returns in the U.S. only. We reserve the right to limit quantities. Smartwool reserves the right to cancel orders arising from pricing, promotions, or other errors. We reserve the right to end or extend this promotion at any time without notice. is not directed to children under age 13. Void where prohibited. Smartwool, the Smartwool logo, the little guy logo, the brand flag and PhD are trademarks of TBL Licensing LLC.
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