SmartWool PhD Mountaineering Sock

The SmartWool PhD Mountaineering Sock is everything you loved from the classic SmartWool Mountaineering sock but with extra strength and durability. The PhD Mountaineering 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 Mountaineering 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 and a heavy cushion heel and toe for maximum comfort and protection.