About this item 80% Polyester/ 20% Cotton Serta waterproof heated mattress pad can protect your bed from unwanted spills and pet accidents and always keep your mattress clean and fresh. Fits most premium mattresses, up to 17" thickness. Queen and larger sizes come with dual zone temperature capability and 2 controllers to conviniently adjust each bed side independently based on everyone's personal comfort. Features smart technology to keep your bed warm, equipped with 10 heat settings. And a 1-12 hour auto shut off safety timer. That you can set in 1 hour increments up to 12 hours max. 1 Heated Mattress Pad: 78"W x 80"L plus 15"D with all elastic to fit 17" thick mattress; controller cord 11ft, power cord is 6ft; DO NOT LEAVE CONTROLLER COVERED WHEN IN USED TO AVOID OVERHEATING. Designed with your safety in mind; it is ETL certified and independently tested to provide highest safety. Conveniently machine washable and carry 5 years warranty.