Pro-Line InGround trampoline combi 10, HD-Plus edge and free ladder The difference between the HD-Plus edge and our Pro-Line edge is that the HD-Plus edge is extra thick (3.5 cm) and contains extra Vinyl (0.8 mm). The edges are also designed in such a way that no water remains on them. As a result, the HD-Plus edges have a longer warranty than our Pro-Line edges, namely 5 years! The Avyna InGround trampolines are among the best inground trampolines worldwide. 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 who could help you.