It amazed me how well they hold. I had a lost a cover to an old LCX-20 and thought the HDS 7 cover would fit. It would not. I happened to be at the OI on Sam Rayburn and staying with Doug Swann. I asked him if he wanted it as a spare. He said he would take it but that he would never lose his covers and proceeded to tell me to go over to his boat and try to take his covers off. That is one thing Humminbird could learn from Lowrance. I keep a bungee cord around my Humminbirds to keep from losing the covers on the road. I also have an HDS 7 at the bow of my rig now and I have not had ANY problems with the cover coming off.Jim EbarbMany, LA (Toledo Bend Lake)2004 Cougar/ 225 OptimaxHumminbird Helix 12 Chirp SI on BalzOut Mount at bowLowrance HDS 7 at bowHumminbird Helix 12 Mega SI on Ram Mount at ConsoleLowrance HDS 8 in dash at console