Top layer: 80% nylon 20% spandex / Bottom: 95% cotton 5%spandex MATERIAL??Top layer:80% Nylon 20% Spandex; Bottom:95% cotton 5% Nylon; Made of updated high quality fabric with high elastic force, they are ultra-soft and smooth to fit your feet. Invisible socks with super soft comfort feeling with great ability to soak up sweat. Keep dry all day. 2 SIZES: High elastic force with 2 Sizes design can fit most women, No worry about the toe tear and tight. [ US 6-8 ] [ US 8.5-10 ] ANTI SLIP DESIGN: Silicone gel circle on the side keep firmly on your instep and heel grip, will not fall off the feet. BREATHABLE MESH: The socks bottom are made of cotton with a breathable nylon fabric covering toes and non-skid silicone tabs at bottom, which make your feet stay dry and fresh all day. REAL NO SHOW SOCKS: This is an EXTREMELY low cut sock, no more worries about awkward peaking out sock. Wear the real no show socks with your favorite ballet shoes, pumps, high-heel shoe, sneakers, Flat shoe, Boat Shoes, Loafers, ect.