4 Degree elite fit system for a dialed-in, performance-oriented fit. Indestructawool technology for enhanced durability SW001858 Body-mapped mesh zones for added breathability. Shred Shield technology reduces wear from toes Women's specific fit: narrower heel and slimmer fit 59% Merino Wool 9% Nylon 30% Recycled Nylon 2% Elastane 4 Degree elite fit system for a dialed-in, performance-oriented fit. Indestructawool technology for enhanced durability