Whether traveling by plane, train, car or bus, any trip lasting more then a few hours can leave legs swollen and fatigued. Swelling and aching legs could lead to a more serious condition called deep-vein thrombosis (DVT), which involves the formation of blood clots in the deep leg veins. The likelihood of a DVT developing is increased during prolonged inactivity. Jobst Travel Socks deliver clinically proven gradient compression and counteract the effects of inactivity, helping to protect and energize legs. Aids in the prevention of swelling and aching legs, ankles and feet. 15-20mmHg, closed toe, latex free.