Scholl Flight Socks are medically proven to help prevent DVT by helping to improve blood flow. Designed 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 revitalised. Scholl Flight Socks are ultra soft have a comfort top and look and feel like normal socks. 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. Compression level 14-17 mmHg (18.7-22.7hPa). Made to conform to Bristish Standard:BS6612:1985. Fibre content 93% polymide, 7% Elastane. UK 3-6 36 - 39 Calf: 14'' - 16'' (35 1/2cm -40 1/2 cm) Ankle: 8 3/4'' - 10 1/2'' (22 1/2cm - 26 1/2cm) Caution Text Scholl recommends you measure your calf and ankle to ensure correct fit. If the product feels loose, restrictive or if you experience pain or discomfort whilst wearing, discontinue use and consult a healthcare profession for guidance. Scholl Flight Socks are designed to be worn in place of normal socks throughout your entire journey. Always wear both socks and ensure they are pulled up to just below the knee. A detailed information leaflet is included in this pack please keep this leaflet for future reference.