SMARTWOOL PHD PRO ENDURANCE PRINT CREW SOCKWe asked pro athlete, Rob Krar, to help us create the ultimate running sock based on his experiences and insights. This purpose-built sock features Shred Shield(TM) technology to reduce wear from toes, activity-specific minimal and targeted sole cushioning, and a new malleolus ankle cushion designed for protection on the most rugged trails. With a colorful mountain design, you'll be running your best and looking your best, too. *Due to the unique printing process, each sock may vary in pattern and color from images on site and per pairFEATURES4 Degree(TM) Elite Fit SystemFor a dialed, performance-oriented fit with flex zone at ankle jointIndestructawool(TM)Indestructawool(TM) technology features a patent-pending construction method for exceptional durability and comfortMesh VentingMesh ventilation zones provide optimum moisture management and maximum breathabilityPhD(R)Built for Performance in the Highest DegreeShred Shield(TM)Shred Shield helps reduce wear from toesUltra Light CushionThe absolute minimum between you and your shoes.Virtually Seamless(TM) ToeSmoothed out toe seams for ultimate in-shoe fit and comfortTECH SPECSSock Height: CrewRob Krar signature sockMinimal and targeted sole cushion; Achilles heel cushionMalleolus ankle cushion for protection on the most rugged trailsVirtually Seamless(TM) toe for enhanced comfort7.5" overall height360deg print technologyMade in USA of Imported Yarns: 57% Merino Wool, 38% Nylon, 4% Elastane, 1% PolyesterStyle: SW001163