Long periods of inactivity combined with the cramped conditions and dehydration which can occur on long journeys can cause a number of circulatory problems including deep vein thrombosis dvt blood clots scholl flight socks sheer are medically proven to help prevent dvt by helping to improve blood flowdesigned for continuous comfort they effectively help relieve tired aching legs and swollen ankles so that you arrive at your destination feeling refreshed and your legs feel revitalisedsch