Only the pure stuff is allowed to pass through this innovative Robelle Mesh Winter Cover. Unlike most winter pool covers, melting snow is allowed to filter through the mesh, which results in less wear and tear. But like all winter pool covers, unwanted and messy debris such as twigs and dirt are kept out. The cover features a three-foot overlap that ensures coverage of the entire pool including its rails, and a double-stitched binding constructed of ultraviolet-inhibiting polypropylene material is sewn around the perimeter. Comes with a 12-year warranty.