Features industrial grade thick PVC skin material, the Ziva Power Core Bag comes with heavy duty nylon straps. It has easy-to-clean surface and air hole caps that lets air release during compression. For even distribution of weight, the Core Bag features sand filler in special liner bag. Ideal for total body workout, it is ideal for building core strength and building big muscles in the body. Works upper, lower and core, the ZIVA Power Core Bag is a must have in professional fitness studio. Train just like the way you want and get into shape with routine workout with the help of this incredible total body workout tool.