With all of the features that the Smartwool Men's Run Zero Cushion Low Ankle Socks offer, your newest technology may be in your sock drawer. Indestructawool technology provides you with enhanced durability, while a 4 Degree elite fit system makes for a performance oriented fit. Shred Shield technology reduces wear and tear from your toes. The Run Zero Socks are breathable, comfortable, and built to help take you farther.FeaturesTargeted cushion in specific places4 Degree Elite Fit System for a dialed, performance oriented fit with flex zone at ankle jointIndestructawool technology features a patent-pending construction method for exceptional durability and comfortShred Shield to help reduce wear from toesUltra light cushion between you and shoesBody-mapped mesh zones for added breathabilityVirtually seamless toeAchilles tab designed to prevent sock from slipping down into footwear45% Merino wool, 50% nylon, 5% elastane