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: Crew, CUSHIONING: Full Cushion. CONTENT: 61% Merino Wool, 12% Nylon, 25% Recycled Nylon, 2% Elastane