Design: Ultra-Dense Foam enclosed with heavy-duty PVC fabric for durability Vinyl coating keeps the box tear-resistant and sturdy as you perform continuous jumps and exercise routines Rotate the box for more challenging heights Adjust to three different heights: 28", 24", and 20" Feet can easily grip to help you avoid slipping Foam construction helps prevent shin injury The lightweight design weighs 11 lbs Supports up to 550 lbs