Soft cover and high-density foam keep students safe from injury if feet or knees catch the box when jumping. Nonslip surface on both sides ensures the box and student won't slide when landing. Octagon shape offers variety to square boxes, and sewn-in handles provide easy transport. Set includes 3 sizes for all ages and to allow for easy progression: 6"H (15cm), 12"H (30cm), and 18"H (46cm) and a laminated exercise guide. Easily stack boxes with Velcro® attachments for even more height options.