Burton Men's Merino Phase Socks 39% Nylon, 21% Merino Wool, 17% Acrylic, 11% Polypropylene, 10% Nanoglide, 2% Spandex Imported Ergonomic, Articulated Left and Right Motion Fit Medium and extra-density cushioning throughout sock Quick-drying and stink-proof polypropylene reinforced footbed Elastic arch and ankle support, chafe-free Link toe seam, sock lock reinforcements, stay high comfort band and dry ride ultra WICK Venting toe panels Lightweight