Etan Hi-Flyer In-ground Trampoline – green. For anyone who just wants a good trampoline but does not want to spend too much money, the Hi-Flyer is the ideal trampoline. This model is especially designed for digging in. The thick springs provide a sublime jumping comfort and the thickness of the safety pad provides sufficient protection in the event of a fall so that children can safely enjoy this trampoline to the fullest.