Stripe Active No-show Summer Casual Socks Cushioned Hidden Liner Low Cut Loafers 82% Polyester/16% Acrylic/2% Spandex Imported Machine wash in cold water with similar colors Marterial:82% Polyester/16% Acrylic/2% Spandex NON-SLIP SILICONE GRIPS inside the heel to prevent slipping off Breathable Construction helps prevent growth of odor-causing bacteria in the sock Lightweight sock uniquely designed to be invisible and feel invisible Great fit, super comfortable and durable wearing.