DeFeet Argyle Wool Socks MD Gray/Pink The Wooleator is still in the 'Thin' sock category This is a wool version of the popular Aireator Aireator mesh on top of sock helps air flow and keeps your feet comfortable StayFast flat-knit cuff to keep the sock in place 63% Merino Wool, 26% Nylon, 10% Cordura, 1% Lycra