Winter pool cover to be used with traditional above ground swimming pools - Solid material will not let water pass through
Pool diameter: 21 feet - Cover diameter: 25 feet (including extra material)
Heavy-duty polyethylene material - All seams are heat sealed for better performance
4 foot overlap (Includes 4 feet of extra material beyond pool size, making this cover easier to install, included in cover size above) - Includes winch and cable, which should be used to secure the cover through the grommets