Each Vuly Thunder trampoline is designed to bring safe, no-spring bouncing to more families, with the Compact Leaf Spring system. 'M'-sized trampolines fit well into families that have one or two children and a little bit of extra space outside. The Polyethylene enclosure on the Thunder trampoline is made for Australian weather - with superior UV-resistance and protection. It's both taut and fine mesh protects little digits and prevents tearing. All doors on our new trampoline have a more flexible opening, with greater give when you're coming in and out, but it snaps completely shut when you bounce.Twice-coated galvanised steel on the frame and heat-treated Leaf Springs mean that all metal components on all Thunder trampolines are protected against corrosion and snapping. There's also not a single trampoline in the world without coil springs that can match Thunder's certified weight capacity of 150 kg. Based on heavy-duty suspension systems, the Leaf Springs on Thunder trampolines don't twist and strain knees like coils or rods can. They provide a perfectly upright rebound every time. Our new Leaf Spring design is also 'one piece', making them stronger, with an even better bounce. Unlimited fun is also included with every Thunder trampoline, with the HexVex Game Mat.