slackline tree protection for whoopie slings It's official now: Dyneema whoopies don't harm trees if they are used with raed TreePRO, the only carbon fibre reinforced tree protection on the market. Read the full study, authored by the International Slackline Association and get the lightest slackline anchor set available today:  Many thanks to Philipp, Lisa, Thomas, Ruth, Bradley, Sonya and Jan for the huge efforts everyone of them put into this study and the ISA in general. You all are really pushing the whole slackline community to an awesome direction.