Hilly Twin Skin Anklet Med Running Sock - Black/anthracite Additions: Machine Washable but on a cool Sports wash. No Tumble Dry Material Content: 50% Nylon (Polyamide), 22% Polyester (Dri Release®), 21% Polyamide (Q-Skin®), 4% Cotton (Dri Release®), 3% Elastane (LYCRA® SPORT) Washing Instructions: Machine Washable Hilly Twin Skin Medium Cushioning Anklet Socks The Hilly Twin Skin Medium Cushioning Anklet Socks are the ultimate anti-blister double-layer sock. They minimise friction on your feet to keep them comfortable. Double-Layer Construction - Prevents rubbing that cause blisters for a distraction-free run. LYCRA Sport Fibres - Ensure lasting comfort, fit, shape and performance. Y-Heel - Improves the fit and reduces slippage. Q-Skin Inner - Wicks away sweat and external moisture. drirelease E.C.O. Outer - Ensures a rapid dry time. Vented Upper and Outer - Allows cool air to circulate. Flat Toe Seam - Further reduces irritation and slippage. Material Composition - 72% Polyamide, 21% Polyester, 4% Cotton, 3% Elastane. Designed with a double-layer construction, the Hilly Twin Skin Medium Cushioning anklet socks help to prevent rubbing and friction which cause blisters so you can stay distraction-free throughout the run. The LYCRA Sport fibres ensure lasting comfort, fit, shape and performance while a Y-heel design helps to improve the fit and minimises slippage. A Q-Skin inner transfers sweat and external moisture to the drirelease E.C.O. cotton outer fabric where it can be evaporated for a rapid dry time. The vented upper and outer allows cool air to circulate to help control temperature and finally, a flat toe seam further reduces irritation and slippage so the socks remain in place.