FlatLevel trampoline set 223 Our smaller FlatLevel rectangular trampoline of 305 x 225 cm is level with ground level, because the double trampoline frame is equipped with a PVC formwork that goes completely 22 cm into the ground. The Avyna Pro-Line rectangular trampoline has the latest AirStream jumping mat that guarantees the best jumping result because the air leaves the trampoline through the mat. The trampoline edge remains firmly in place with every jump and the double galvanized springs remain completely covered. Avyna Pro -Line trampolines meet all safety requirements, but if you want to make jumping even safer, click here for the trampoline safety nets. We give a lifetime warranty on the trampoline frame and 10 years on the double galvanized springs. Have someone else dig in Do you want someone else to dig in the trampoline? We work together with various gardeners and some of our dealers also dig in. Take a quick look here if you could help.