The Outdoor series was designed for running and hiking on rugged trails in unpredictable weather. Newly upgraded to Merino wool construction, the Outdoor Midweight Crew Wool toesock features a ribbed leg and crew height for a tighter, more ergonomic fit that keeps out dirt and debris. The midweight terry footbed increases comfort, while the signature Injinji five-toe design ensures the foot can be fully utilized by promoting natural foot splay. Fibre Content: 75% Merino Wool, 22% Nylon, 3% Lycra.