95% Cotton/5% Nylon Bottom: 95% cotton 5% Nylon; Top layer: 85% Nylon 15% Spandex. NON-SLIP TRIPLE GUARANTEED: silicone heel grip, silicone sole patch and silicone gel ring inside the top layer. The advanced design protects socks from crawling down into the shoes when you are walking and running. Non-skid socks do not slip off you heel and they always stay on. High quality material: they are ultra-soft and smooth. The cotton sole keeps skin cozy without any irritation and keeps the sweaty feet comfortable. The nylon top layer is as soft and silky as silk, granting a cool, dry feeling even on the hot summer days. These ultra low cut socks never show with various shoes. They do not cover the entire top part of the foot like a footie. Elastic comfortable socks perfect for ballet shoes, pumps, high-heel shoe, sneakers, Flats, Boat Shoes, Loafers.