DESIGNED FOR WOMEN: Two different sizes available. US women’s shoe sizes 5.5-8.5, US women’s shoe sizes 9-12, machine or hand wash. NON-SLIP DESIGN: Enhanced silicon grip on the heel prevents these socks from slipping, ensure the socks stay on your heel the whole time. MATERIAL: 70% Cotton, 25% Polyester , 5% Spandex. Comfortable,Breathable, Durable and they wick away sweat. ULTRA LOW PROFILE: These hidden invisible socks are designed to hug your feet, almost completely hidden inside provide invisible feel. They are a good match for all your sneakers, boat shoes, loafers, etc. SKIN-FRIENDLY: Low cut liner socks made of premium.Do well in elasticity, comfortable, durable and sweat wicking , take care of your feet.