Essentials Polyrest Protectors - 140x200cm The double size Polyrest mattress protector features a polyester filling and highly durable polypropylene cover, designed to keep your pillows free from moisture and completely odourless in preparation for the arrival of your next guests. The generously thick moisture-resistant protector features a 25cm deep skirt, and is easy to launder, making it perfectly suited for use in resorts, guesthouses, hotels and B&Bs.