The extra wide straps of our hammock suspension are already designed to protect the tree from damage to the bark and cambium (the water-bearing layer). In special cases we recommend using an underlay. You can't go wrong with SÄVE, especially with particularly young trees or with an installation that takes longer than a few days. Take a look at ours Blog over, there we have a very detailed article about protecting trees and how best to hang up the HÄNG. Or use ours Hammock HANG Calculator. If you attach your HANG to a tree for a long time or, for example, to sharp edges on the balcony, you can also use our protective pad SÄVE to use.