Sunny Health & Fitness No. 072 3-in-1 Foam Fitness Plyo Box MATERIAL: Ultra Dense Foam enclosed with heavy duty PVC fabric for durability. The vinyl coating keeps the box tear-resistant and sturdy as you perform continuous jumps and exercise routines. ADJUSTABLE SIZE: Rotate the box for more challenging heights. Instead of buying three separate boxes, this jumping box gives a variety of size choices for a versatile workout. Can be easily adjusted to three different heights: 28", 24", and 20" inches. SLIP-RESISTANT SURFACE: The box provides a surface your feet can easily grip to help you avoid slipping. Foam construction helps prevent shin injury. The premium dense foam is designed with comfort and flexibility in mind to protect your body. GREAT EXERCISE TOO: Targets shoulders, Arms, chest, ABS, glutes and legs; strengthens and improves overall core stability. Versatile capabilities allow for various full body exercises; cross fit friendly. PORTABLE: The lightweight design weighs 11lbs, which makes the plyo box easy to move. The jump box can support up to 550lbs.