Hit the trails with the added comfort of your Smartwool PhD Outdoor Light Pattern Crew. Sold as a one-pair pack. Crew-cut style sits at calf. PhD technology offers performance to the highest degree. 4 Degree Elite Fit System uses two elastics for greater stretch and recovery to keep the sock in place. Indestructawool technology features a patent-pending construction method for exceptional durability and comfort. Mesh ventilation zones provide optimum moisture management and maximum breathability. Y-stitch heel. Light cushioning underfoot provides protection. Virtually Seamless toe for most comfortable wear. Style Number: SW001146 55% wool, 42% nylon, 3% elastane. Machine wash warm, dry flat. Made in the USA.