Champion Sports Foam Plyo BoxThe Champion Sports foam plyo box is great for players who are looking for a training tool that assists in improving jumping, speed, and other various plyometric based skills. Users can stack boxes together or use them alone to train using the desired height. The boxes are made with a 100% foam core that won't break down or soften over time. These plyo boxes feature Velcro flaps keep the boxes in place and also work as handles for easy re positioning.