80% Polyester/ 20% Cotton Serta - Rest easy with a brand you can trust. Serta’s heated mattress pad is ETL certified and independently tested to meet the highest safety standards. With decades of experience and hands on expertise, Serta is a true champion of comfort for all Convenient & Easy to Clean - 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 Dual Control - Queen and larger size electric heating mattress pad come with 2 controllers with dual zone temperature capability to conviniently adjust each bed side independently based on everyone's personal comfort Multifunctional - Serta heating electric mattress pad 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 Size - 1 Heating Electric Mattress Pad: 60"W x 80"L plus 15"D with all elastic to fit 17" thick mattress; power cord is 6ft; DO NOT LEAVE CONTROLLER COVERED WHEN IN USED TO AVOID OVERHEATING.