Calf support, also called calf sleeve or calf guard, refers to a sports protector used to protect people's calves. Calf support is a tool to protect the legs from injury in daily life, especially during sports. It is now more common to make a protective sleeve for the legs, which is comfortable and breathable and easy to put on and take off.In modern sports, the use of calf support is very extensive. The calf support is a kind of compression sleeve. The working principle is progressive compression. In layman's terms, the calf brace must precisely control the pressure distribution and form a top-to-bottom gradient pressurization, which can perfectly assist the calf venous valve to help blood flow back and effectively relieve or Improve the pressure on the veins and venous valves of the lower extremities, so as to achieve a smooth and unobstructed blood and lymph circulation system.