Hiking / Trekking / Trail Running / Mountain Racing Black, White/Dark Gray: Foot surface: 58.1% Acrylic, 25.3% Regenerated Cellulose Fiber, 14.1% Nylon, 2.5% Spandex (excluding elasticated parts and decorative yarns) Vitality Green/Pine Green: Foot surface: 43.0% Polyester Fiber, 42.1% Cotton, 12.7% Nylon, 2.2% Spandex (excluding elasticated parts and decorative yarns) Five-toe separated design fits toe movement and prevents friction blisters Mesh structure quickly wicks away foot moisture Arch support design secures the foot during movement Seamless toe construction reduces friction on the toes 3D heel design ensures a snug, non-slip fit Polygiene® antibacterial technology for long-lasting freshness