F-7 15 x 41 Double Layer Navy. 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. F-7 15 x 41 Double Layer Navy. The F-Series are double layered making them softer, more durabl e reversible. Master Fender Covers are specially designed to protect the topsides and hull from fend er scuff and reduce the need for expensive gel coat repairs. They are made from a premium stain resi