<b>PhD:</b> Built for Performance in the Highest Degree<br><br><b>4 Degree Elite Fit System:</b> Uses two elastics for greater stretch and recovery to keep the sock in place<br><br><b>Indestructawool:</b> Indestructawool technology features a patent-pending construction method for exceptional durability and comfort<br><br><b>Mesh Venting:</b> Mesh ventilation zones provide optimum moisture management and maximum breathability<br><br><b>Light Cushion:</b> The ideal cushion for varied trail and road terrain<br><br>Experience durability at its peak with the PhD Outdoor Light Crew. Featuring Indestructawool technology, a patent-pending wool-based durability construction, these socks are ready for any adventure on your list. Plus, with redesigned mesh zones, a Virtually Seamless toe and the 4 Degree elite fit system, these socks have comfort covered.<br><br><b>Care Instructions:</b> Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.