Clew Strap For Laser Ref: 2005 The ultimate clew tie down system for the Laser/Topper. One end of the strap has the loop velcro on both sides. It then sandwiches between the hook velcro, providing so much contact area that the strap will not slip. 25 mm wide webbing. A piece of hard material reduces friction between the webbing and the boom. Easy to attach, but it won't loosen and it will still slide nicely along the boom