VTG Electric Heating Warming Bed Mattress Warmer Cover Twin/Half King M-38 #525082 Electro-Warmth - Sleep on it - not under it! Heat rises! 60" x 38" 50/50 Poly Cotton Please read instructions - heating takes time - up to 30 minutes or more - but it does heat well. Preowned estate sale find. Cover is in good working condition - Tested. Only a few small stains from storage. The cord has some staining. Box has storage damage. I have 2 available - this sale is for only 1. Only one has the paperwork shown in the photos and they will accompany the first sale only. No paperwork with the 2nd sale - however - you can read/print from the pics.