The Skywalker Trampolines 15' Square Trampoline with Enclosure and Spring Pad features a 15'L x 15'W square design with a galvanized steel frame. The enclosure netting is made of polyethylene mesh, while 96 large, 7.5" springs provide great bounce. The T-Bracket assembly eliminates frame twisting, and the jumping mat is made of heavy-duty, UV protected polypropylene for strength and durability. Zippered entrance with positive-latch clips. Skywalker Trampolines 15' Square Trampoline with Enclosure Blue - Trampolines at Academy Sports