EcosSox Bamboo Viscose Half Cushion Hiking Crew Socks - Keep Your Feet Dry, Odor, & Blister Free 70% Bamboo Viscose, 25% Polyester, 4% Rubber, 1% Spandex Eco Friendly Bamboo Construction Provides Advanced Moisture Wicking Ultra-Soft - Exclusive EcoSox Half Cushion FootBed Provides Cushioning and an Athletic Fit Ultra-Dry - Fights Foot Odor and Blisters Arch Support - Better Fit / Fights Foot Fatigue Thermo-regulating: Cool in the summer, Warm in the winter