25' x 45' In-Ground Rectangle Pool Winter Cover - 8 yr Solid winter cover for 25' x 45' inground pool (cover = 30' x 50' rectangle) 5 mil, blue on black triple laminated polyethylene with heat sealed seams for added strength. Edges incorporate a sewn-in polypropylene cord for reinforcement. Aluminum grommets located in each corner. 2" x 12" water tube loops are spaced every four feet. 8 year limited warranty, 1 year full.