The Deluxe 12' x 24' Winter Pool Cover is made of extra strong polyethylene sheeting woven with thick polyethylene stitching, which provides superior strength and durability.Adding a Deluxe oval winter cover will protect your pool from the harsher elements of winter and keeps debris, algae and bacteria out of the water, minimizing maintenance when re-opening the pool in spring. Safeguard your pool to ensure years of backyard enjoyment and family fun.The Polarshield Deluxe Winter Pool Cover includes an extended 10 Year Limited Warranty, with 2 Year Full Coverage. View the attached warranty for more detailed information.