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The new PhD Sock line from Smartwool features models with the very highest degree of performance and fit for active mountain sports use. PHD Socks feature WOW Technology & 4DegreeFit. 4-Degree Fit System Utilising technology inspired by today's athletic footwear the bar has been raised for performance socks in terms of fit, feel and performance through the use of arch, heel and upper instep bands. This additional foot control is further enhanced with a metatarsal brace and perimeter mesh vent panels which keep foot temperature in the comfort zone. WOW Technology Wool on Wool technology that puts more wool into the sock by adding an additional layer of 100% Smartwool Duroyarn in the high impact zone areas to give up to 30% more durability. This combined with reduced Nylon content means the socks move moisture better and control temperature and odour even more effectively.