Unlike other fender covers, Dolphin covers WILL NOT absorb water. Absorbing water loosens the fit and covers start to sag and droop. After a few washings they fade, stretch and go out of shape, making for a sloppy look and fit. Dolphin Fender Covers have an elastic top and bottom. They also have Velcro straps, so the covers will never fall off. The stretch polyester fabric of all Dolphin Fender Covers is antimicrobial, which will not fade, mold, mildew or rot. Std. Pk. of 6.