this is it! springfree trampolines. no springs to hit since they're all underneath | Backyard trampoline, Backyard, Trampoline
Amazon.com : Free Jump Trampoline 14FT Round Springless Trampoline with Safety Enclosure Net - 14' Outdoor No Spring Trampoline for Kids, Teens and Adults - 14 Feet Recreational Trampoline with Ladder : Sports & Outdoors
13 x 13 Jumbo Springfree Trampoline - Playground King