Vibrox applies 14-16mmHg pressure at the ankle gradually reduces over the calf, which is the ideal pressure for reducing foot fatigue symptoms Over the calf graduated compression stockings is effective in reducing the actual swelling and subjective feeling of heavy and tired legs Prevents inappropriate tightness and itching at calf Magic of Lycra: For perfect fit and functionality. Invigorating and gentle massage increases the level of energy of legs The feeling of aching, fatigues and tiredness is also reduced making your legs energized throughout Fiber content: 80% Polyamide, 20% Elastane Immobilization in airline seats for long flights put people at a high risk of economy class syndrome medically known as Deep Vein Thrombosis. It is caused due to low mobility fostered by cramped leg room in airline and dehydration, resulting in swollen ankles, aching legs and heavy and tired feet to more severe conditions such as DVT. DVT strikes all irrespective of age, sex and physical condition. Vibrox helps reduce every day leg swelling and leg fatigue, improve venous circulation, prevents DVT and make the legs feel vibrant. Over the calf socks with graduated compression is effective in reducing fatigue symptoms of active men and women. Caution: Do not use Vibrox if you have history of venous disease (Peripheral Arterial Disorder), Diabetes & currently using compression stockings. Size Ankle Circumference (in Cms) Foot Length in Cms Non Stretch Stretch Small 19-23 17 27 Medium 23-26 18 28 Large 26-29 19 29 X Large 29-31 20 30