Top: 85 Gsm Microfiber; Filling: Light Bonded Polyfill; Bottom: 40gsm Non-woven Fabric, 15" Poly Skirt 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 MATTRESS PROTECTOR - Serta soft microfiber electric mattress pad twin can protect your bed from unwanted spills and pet accidents and always keep your mattress clean and fresh. Fits most premium mattresses, up to 18" thickness DUAL ZONE TEMPERATURE - Queen and larger sizes come with dual zone temperature capability and queen and king size heated mattress pad with dual control function to conviniently adjust each bed side independently based on everyone's personal comfort AUTO SHUT-OFF - 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 and conveniently machine washable SIZE - 1 Heated Mattress Pad: 39"W x 75"L plus 15"D with all elastic to fit 18" thick mattress; power cord is 6ft; DO NOT LEAVE CONTROLLER COVERED WHEN IN USED TO AVOID OVERHEATING