One 63 in square unit works three ways: a playpen for quiet time, a ball pit once balls are added, and a trampoline floor for jumping. See-through PVC side walls let a parent keep eyes on a child from across the room instead of hovering at the opening. Triangle and rectangle cutouts at 14.5 in and 19 in give kids their own doors to crawl through. Thickened PVC wipes clean after snacks and holds up to 110 lb, and double-action valves inflate and deflate it quickly. Balls are not included. Two repair patches ship with the 11 lb unit for long-term upkeep.