EcoSox Crews are High Performance Sox Woven from Viscose Derived from Bamboo Fibers. Exclusive construction provides comfort in a wide range of conditions.. The moisture management and breathability of these fibers remove sweat and moisture away from the skin where it can evaporate to help keep your skin dry and clean and breathe to regulate temperature. Odor-causing germs can not grow without moisture, and the evaporation process helps keep your skin cooler in the summer and warmer in the winter. The next to skin smoothness reduces friction and helps prevent blisters from the sock.