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PhD: Built for Performance in the Highest Degree4 Degree Elite Fit System: Uses two elastics for greater stretch and recovery to keep the sock in placeIndestructawool: Indestructawool technology features a patent-pending construction method for exceptional durability and comfortMesh Venting: Mesh ventilation zones provide optimum moisture management and maximum breathabilityHeavy Cushion: Heavy cushioning offering significant impact absorption for extended backcountry excursionsWhen ultimate warmth and comfort are what you need, pull on the PhD Heavy OTC. We’ve updated this classic style with Indestructawool technology for ultimate durability and the 4 Degree elite fit system to keep the sock in place. Heavy cushioning provides warmth for even the coldest days.Care Instructions: Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.