This Robelle Mesh rectangular winter cover features a 10 x 10 Scrim count (threads per square inch) and a material weight density of 3.1 ounces per square yard. The black mesh material has been treated to inhibit damaging ultraviolet rays. Made of polyethylene, this exceptional quality in- ground winter pool cover has a 4-ft overlap and is made for a 16' x 32' Rectangle pool. This cover is made to be secured with water bags on the pool deck. There are grommets with water bag loops approximately every 4 feet for the use of water tubes (sold separately) to secure the winter cover onto the pool deck. The overall size of this cover is 20' x 36. It is designed for a rectangular in-ground pool. All Robelle Mesh winter pool covers come with a 10-year warranty.