New SKLZ HOPZ Vertical Jump Trainer strengthen jumping muscles Black Red Made with moisture wicking stretch 30:Black Grey Made with moisture wicking stretch material to keep you cool and dry Lightweight protection on key contact zones Stretch mesh for maximum breathability and comfort Engineered with lightweight performance fabrics to wick away sweat Flexible wrap around rib guards for full coverage supportive waistband for controlled comfort Strap on to build explosive leg power and strengthen jumping muscles Move resistance cables on belt to target specific muscles Change resistance cable quickly with patented Slide Lock on belt and ankle straps Adjustable belt with side padding fits better and helps with proper cable placement Durable cables and ankle straps with built in shoe harness keeps straps in place