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.