10-Year 18 ft Round Pool Winter Cover With Cover Clips Triple laminated poly-constructed inner scrim is topped by a premium weather resistant top coating All seams are heat-sealed (not sewn) to prevent water from seeping through the cover Comes complete with heavy-duty vinyl coated cable and winch Cover is navy blue with a black underside to inhibit algae growth Includes 30 cover clips that secure cover to top rail, preventing wind from getting under the cover