VERSATILE WORKOUT: This Foam Plyo Box will give you the edge you need in your cross-training, aerobic exercises, or physical therapy. It does not matter if it is box jumps, push-ups, dips, or step-ups; this box has you covered! 3-IN-1 SIZES: Start on the 20-inch side to get an idea of what your vertical can handle. If (and when) that gets too easy, simply rotate the box, and add 4 to 10-inches, pushing yourself to jump higher and burn those calories! SOFT AND SLIP FREE SURFACE: Unlike other wood boxes, we have designed this workout box to be soft so that you don't have to worry about banging your shins against the edge. The material is a slip-free surface, meaning you can have stability with every single set of jumps. DURABLE FOAM CONSTRUCTION: By using durable foam in our construction, we have created a solid foam platform that can support countless hours of workouts. Compact and durable, this box is the tool you need to take your workout to new heights. NOTE: Use caution when performing jumps on the 30" side to avoid tipping the plyo box. Always land your jumps on the center of the landing surface. Not recommended for use on slick or slippery floors!