For Sweaty Smelly Feet: 67% Bamboo Bamboo Fiber, 17% Nylon, 12% Polyester, 3% Spandex, 1% Elastic. The hollow structure of bamboo fibers makes them super moisture wicking and breathable to keep feet stay comfortably fresh. Our womens bamboo liner socks has the property of anti-odor for sweaty smelly feet, which keeps your feet odor free. Guaranteed Non Slip: A big Non-Slip Silicon Heel-Pad keep the sock snug and in place, preventing our no show socks from slipping into your shoes. Y Heel Construction and Elastic Topline minimize slipping, which makes for a more comfortable fit. Low Enough: Truly invisible for all your casual shoes like Flats, Boots, Loafer, Sperry, Boat, Ballet Shoes. Also matches athletic shoe for running or doing exercise like low cut vans, sperry, converse, adidas stan smith, nike sneakers, sports, crossfit and running shoes etc. Comfort in Style: +MD unique hiding seam toe design do the best to make your toe release from any discomfort or irritation. Made with stretchy, flat knit won??t leave pressure marks on your feet and provide a soft and comfortable layer. The varying tension of the fibers and knit patterns adds style under your low profile shoes. Stretchy and Durable: Bamboo fiber will be softer after the first washing. We recommend that you wash the invisible socks before wearing them. Bamboo socks may look smaller, but they are super stretchy. They will keep soft even after multiple washing.