Recommended for long distance travel by aeroplane, train, coach or car, these HJ Hall Flysafe compression socks are constructed with graduated compression to help improve bloodflow. Cotton-rich for coolness and comfort, they boast a compression rating of class 1, 15-19 mmHg, meaning they are clincally proven to help increase blood flow to the heart and aid in the prevention of circulatory problems such as DVT (Deep Vein Thrombosis).