Innovative round trampolines! Bringing together years of Vuly innovations, the Thunder trampoline lets more kids than ever bounce to the edge without coil springs. A great Christmas present ideas for kids! Families with some additional space in their yard and that have kids who want to practise trampolining techniques are best suited to 'Large' trampolines. Twice galvanized tubing and heat-treated Leaf Springs allow the Thunder trampoline to thrive in sun and weather. With fewer than 10 different parts that all click-together during installation, Thunder is also nut-and-bolt-free. Strong and secure, the Polyethylene enclosure on all Thunder trampolines is both taut resistant to UV rays. It and the mat attach to one another, with absolutely no frame of Leaf Spring contact. To ensure longevity and performance in real weather conditions, Vuly also performs 'wet tests' on its UV material. The Thunder trampoline's Leaf Springs put big power into a small package. Vuly's Leaf Springs are based on the suspension systems of long-haul trucks, and with new a design that's pre-curved and rivet-less, edge-to-edge bouncing has never been safer. As with all Vuly trampolines, the Thunder also features the HexVex printed Game Mat system, which provides hours of active entertainment.