Brand New Pair of EcoSox Sport Crew Socks. Colors: Black. Keep your feet feeling fresh and comfy in a pair of bamboo viscose Active Sport Crew socks. Ecosox are woven from bamboo viscose fiber helping to prevent blisters, absorb moisture, and keep your feet smelling fresh due to natural odor fighting properties. Try a pair of the softest socks you’ll ever own and not only will it be a treat for your feet, but they’re great for the environment as well! Available Sizes: Medium.