I have the Dowco " Guardian " brand. The tie strap is a double D type just like a helmet chin strap. Wingstuff has one with a zipper access, which my neighbor has and I see he finally replaced it after years of outside weathering: http://wingstuff.com/pgroup_list/gl1800/558_dowco/mfg/ I bought mine is desperation at a Honda Dealer and paid about $130 without the zipper option ( to give you a price comparison ). Careful slipping it on around the folded antenna mount, it is real sharp ( ask me about duct tape patching !!!!! ).