My son Lost one of his even with double sided tape. I think the problem is that water gets in hind the protectors. Combine the force of the water and the speed of the ski, it's just a matter of time before it happens. It was a middle protector and he's pissed. It sank like others have stated. I don't blame him one bit. I feel it is a Doo could of done a better job with securing them. I also feel that Doo should offer each piece as a replacement part. As it is now you'd have to buy a whole new kit.