Ergonomic desing provide different physical force on thigh,knee and shank at the same time.Thickened knee pad for comfortable using experience.High density resin Fixed keel on the two side to provide strong support and keep the force balanced. If you have any questions or concerns Us any time.We'll give you a satisfactory solution immediately Made of Spandex, strong elasticity to put your legs together while won't press hard on your legs.Suitable for both adults and kids use. Especially designed to correct leg shapes of O legs and X legs. Help balance the leg muscles, let the leg in a straight line, and make you look more beautiful. After-sales: If you have any questions about our , please feel to us, we will you within 24 hours!