Burton [ak]A(R) Endurance Socks Behind the Product Technical Winter Socks. Merino-poly blend insulation, moisture wicking, and elastic comfort. The Burton [ak] Endurance Socks are the pair that stay put and keep your feet warm and dry, all day long. Backcountry or resort, the wool-polymide blend balances insulation, sweat-wicking, and stretch to keep you riding longer. Product Features All-Natural Merino Power A merino blend sets you up for dry, comfy, stink-free feet. Responsibly Sourced Wool The wool blend knit features wool that meets RSW animal welfare and land management standards. Ride-Specific From the extra elastic support to the reinforced heel, they are built to stay put and feel great all day. Tech Specs Fabric 65% Polyamide, 15% Merino Wool, 15% Recycled Polyester, 5% Elastane Features + Tech Ergonomic, Articulated Left and Right MotionFit Quick-Drying and Odor-Resistant Polypropylene Reinforced Footbed All Over Elastic Support Sock Lock Reinforcements Low Profile Welted Cuff Lightweight Imported Yes Warranty Lifetime Warranty Sustainability Responsibly Sourced Wool (RSW)