The HJ Hall Flysafe compression socks will benefit the frequent traveller. In an understated shade of ecru, these knee high socks employ graduated compression from the top to the bottom , clincally proven to help increase blood flow to the heart, aiding in the prevention of circulatory problems such as DVT (Deep Vein Thrombosis). Sizing. Shoe sizes 3-5 should select S/M socks. Shoe sizes 6-9 should select M/L socks. Brand : HJ Hall. Hosiery Finish : Plain. Hosiery Type : Knee Highs. Material : Cotton with lycra. Size : S. Washing Instructions : Machine washable at 30°C.