Sunny Health & Fitness Foam Plyo Box with Adjustable Heights and High Weight Capacity $159.99 Make sure this fits by entering your model number. 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.