The PhD Outdoor Crew Socks, are the best hiking & trekking sock, that Smartwool has made to date. Medium Weight SmartWool cushion with reinforced smartyarn provides the maximum in fit, shock absorbency, cushioning and durability for unparalleled comfort and support. Featuring Smartwool’s new 4-Degree Banded Fit System, the PhD Outdoor Sock utilizes technology used in athletic footwear, to elevate fit, feel and performance to unheralded levels. Showcasing WOW (wool on wool) Technology in High Density Impact zones, the 10-333 helps reduce shock and absorption, helping you perform at your best.

The PhD Outdoor Medium Cushion Sock, features luxurious Smartwool Fibers, providing excellent moisture, temperature and odor control. Strategic Mesh Zones are placed throughout the sock for maximum ventilation, while a flat knit toe seam increase comfort and durability. New to the Smartwool family, the PhD Outdoor sock is ideal for aggressive treks with heavy loads.