CaVida FlexStraps are tension belts with an immense variety of adjustabilities. They are easy to handle and cause no scratches on surfaces as they are just made of silikon. The lenght is 1.10 m and they can be extended unlimited. They are safe, UV and salt resistant. The max lenghtening is 50% of the original lenght. The application is pretty simple: Just insert the tip through one of the various holes, twist the tip, ready. Simply simple.