The Smartwool PhD Outdoor Ultralight Crew sock gives you ultimate protection from the wild elements without bogging you down with extra weight or bulk. ReliaWool technology focuses on higher-impact areas while the Merino wool blend helps to naturally wick moisture and keep your body heat where you need it.
New 4 Degree Elite Fit System uses two elastics for greater stretch and recovery to keep the sock in place
Patent pending ReliaWool Technology in high impact areas provides the longer lasting protection to keep feet comfortable
Strategically placed mesh ventilation zones provide ventilation for temperature and moisture management