Size: MEDIUM (Fits M 6-8.5 / W 7-9.5) 2-PACK Color: Neptune Blue with Red Contents: 56% Merino Wool, 41% Nylon, 3% Elastane From Smartwool: It"s time to take "burr" out of your running vocabulary. Stride out in our Run Cold Weather Mid Crew Socks. A Merino blend and mesh zones designed for runners help keep your feet warm during long winter runs. With a run-specific profile and our 4 Degree™ elite fit system, with two elastics for greater stretch and fast recovery, these socks stay in place at every turn and up every hill. Questions? Leave a comment below!