SmartWool PhD Outdoor Heavy Crew Sock

The SmartWool PhD Outdoor Heavy Crew is a heavy weight mens sock. The PhD Heavy Crew sock uses SmartWool's proprietary 4 Degree Fit sport support system to give you the ultimate in support and a secure comfortable fit around your foot's heel arch and instep. The PhD Medium Crew sock uses ReliaWool Technology in high impact areas providing longer lasting protection and a more comfortable feel. Mesh ventilation zones allow your feet to breath. This SmartWool sock has a flat knit durable toe seam for extra strength.