The Carlisle 911403 Stackable Booster Seat is made of durable polypropylene construction that is sturdy and lightweight with a weight capacity of 50 pounds. The built-in antimicrobial eliminates the growth of odor-causing bacteria. The ASTM Certified Straps effectively secures the child around the waist in harness configuration. Features an integrated cupholder so a tumbler or sippy cup remains in arm's reach.