Summertime Fun with the Halloween 16' Modular Retro Rainbow Inflatable Water Slide. This 16' tall inflatable Waterslide is a real crowd pleaser, providing refreshing fun and thrills to kids of all ages (and maybe a few adults, too). Slide was designed with children's safety at heart, featuring an inflated landing zone with built-in drains that keeps the water level low enough for a good time, but safe enough for kids of all ages.