Pro-Tec 3D Flat Premium Calf Support provides customized compression zones which offer support exactly where you need it most. FLAT KNIT technology allows for customized stitching to achieve 3D shaping of the fabric to deliver an optimum fit. It's recommended for use for minor to moderate calf tightness and strains. Anatomically shaped design provides optimum fit. Vertical elasticity allows for a better range of motion. Provides increased flexibility.