Teko Men's SIN3RGI Organic Merino Wool Light Minicrew Casual Socks 27% nylon Reinforced Panels - Positioned in areas identified as being particularly susceptible to wear in order to prolong the sock's longevity. Air Vents - Allow air to permeate the sock and thereby encourage a cooler, drier, fresher internal environment. Y Shaped Gore Line - Delivers a more accommodating fit. Fibre Content - 36% organic merino wool, 35% EVAPOR8, 27% nylon, 2% elastic.