COMFORTABLE FOAM PROTECTS YOUR JOINTS & SHINS: Filled with 60 lb heavy duty & high density rebonded foam, soft but resilient, reduce impact on your joints and risks of shin injuries. Durable and keeps firm after longtime use. Stable enough with 440 lbs weight capacity. ANTI-SLIP THICK PU SURFACE: Non slip surface texture provides you with stability and safety. No worry to slip off the box. PVC surface resists water & sweat and easy to clean by simply wiping away footprints & dirt. Layer is removable with a durable metal zipper. For easy to wrap back, please don’t tear off the black film covering the foam. 3 HEIGHTS IN 1 BOX FOR MORE POSSIBLITY: Simply rotate the box to get 20 inch, 24 inch and 30 inch heights, no assembling required; Choose the level you want and exert your muscles to their maximum potential in short periods of time. HOME GYM PLYOMETRIC TRAINING: Box jumps are powerful aerobic exercises making you faster, more powerful and springier than ever. Start now with just one box to burn calories and build your lower-body muscles! You can also do push-ups, lunges and dips with the box.