HTM-4 12 x 34 Double Layer Navy. Double layer means softer, more durable reversible. nbsp;. 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. HTM-4 12 x 34 Double Layer Navy. Double layer means softer, more durable reversible. nbsp;. Ma ster Fender Covers are specially designed to protect the topsides and hull from fender scuff and red uce the need for expensive gel coat repairs. They are made from a premium stain resistant, non-abras