The graduated compression provides maximum compression at the ankle with a progressive reduction through the calf promoting blood flow back to the heart.. It helps reduce and prevent swelling for the wearer, maintaining positive circulation and leg health. Measure the calf size and choose the appropriate size according to the size chart on the picture. If you don’t like too much pressure, you can choose a size one size larger, and it will still have amazing results.The size is unisex. These medical compression stocks could be used during or after activity or during pregnancy, running, hiking, martial arts, volleyball, basketball, cycling, baseball, yoga, workouts or any fitness activities. Whether high or low or high impact, these enable you to warm up safely and recover quickly. True graduated compression of 20 - 30 mmHg, with seamless woven construction, these fit snug with no loss of compression after long time wear. If conditions permit, we strongly recommended purchg 2 pairs for the same product to replace them, as this will double its life for each pair. HELPFULL:Helps for Varicose Veins, Pregnant,Relieve Swelling, Spider Veins, Sore Aching Muscles, Edema, Dvt Blood Clots,Anti Embolism Aid,Shin Splints Post, Improve blood circulation after surgery and Tattoo cover up (notice: don't use it when the skin is damaged),Suitable for any exercise or work, such as prolonged use of calf muscles, Sedentary, traveling,standing, walking, running, etc.