These calf compression sleeves are made of good quality durable nylon and spandex fabrics, breathable and comfortable without reducing compression. Combining kinesiology stability with compression fabric properties, effectively stabilizes and increases blood flow to leg muscles and provides enough resistance to perfectly prevent pain and injury in every exercise. True graded compression, this compression calf sleeves improves blood circulation and oxygen flow to the legs even when you are stationary. Ideal for people who stand a lot or sit for long periods of time, can eliminate varicose veins, reduce leg swelling caused by acid swelling and heavy feeling, prevent edema and lymph-edema. Hikers, walkers, ramblers, runners and joggers, outdoor enthusiasts and athletes, air travelers, mountain climbing, drive, cycling, football, golf, skiing skating, weight lifting, boxing, people with leg problems, expecting mother.