The material is Nylon+ Polyester package2 pair(black) COMFORTABLE DESIGN -- graduated compression socks for women and men circulation provide of gradient compression, which are ergonomically designed. Prevention and relief of minor varicose veins, relief of tired aching legs, relief of minor swelling of feet and legs. The inner design of the socks is very soft and friendly to the toes. The material is breathable and comfortable, which can keep your feet dry. ENERGIZE YOUR LEGS-- Compression socks have been shown to help decrease swelling and pain in the legs and ankles. Graduated compressions' whole purpose is to increase circulation, thus improving sports levels in the body. Another benefit of improving circulation is decreasing swelling and fluid retention. Increased circulation decreases swelling and increases blood flow, this reduces the feeling of heavy and achy legs. IMPROVED ATHLETIC PERFORMANCE-- Many athletes are no stranger to compression, in the RICE recovery method used by many coaches, the C is for compression! Compression socks reduce the stress on your muscles during a workout or exercise and help your legs recover quicker, which is why theyre increasingly popular on a races starting line. Compression socks help to prevent injury from happening, allowing for better quality training.