F-7 - 15' x 41' - Double Layer - Black The F-Series are double layered making them softer, more durable & reversible. Master Fender Covers are specially designed to protect the topsides and hull from fender scuff and reduce the need for expensive gel coat repairs. They are made from a premium stain resistant, non-abrasive, loop-knit acrylic fabric, which is both durable and fade resistant. They are available in a variety of colors and sizes to suit your individual requirements.