The Core Challenge Roller combines the essential properties of exercise balls and rollers into one dynamic inflatable roll. The size and shape optimize exercises that strengthen and tone the abs, obliques and core muscle groups, while improving flexibility. The cushioned surface is comfortable making it an excellent tool for exercise and stretch routines.Constructed of durable, burst-resistant vinyl that will support up to 440 pounds. Easily inflates with the Power Pump (sold separately) and is perfect for travel. Blue in color, cleans up with soap and water. DO NOT STAND ON.