The Synth sock uses a special wool blend intended to add some insulation and help keep moisture out. The Cush Mapping Ankle & Footbed keep your feet happy with a little extra comfort where it’s needed. This sock is perfect for long days on the hill. Features : Men’s socks Medium Weight Sock 20% Wool / 16% Nylon / 6% Polypropylene / 4% Elastane Cush Mapping Ankle & Footbed Stay Up Cuff Impact Zone Cushion Air Channel Right & Left Toe Construction Fitted Toe Box Bubble Grip Arch Support Y Heel Reference : J6352301 SYNTH SOCK