Design and Details Indestructawool technology with extended durability zones 4 Degree elite fit system for a dialed-in, performance-oriented fit Additional body-mapped mesh zones for added breathability Virtually Seamless toe for enhanced comfort Comfort welt with 'stay put' fit Height 8" 56% Merino Wool, 11% Nylon, 31% Recycled Nylon, 2% Elastane