I am using this on a 52 inch wide double mattress. I put it on the sheet. I used another smaller pillow under the fitted sheet but then I have to take the bed down and wash the sheets and pillow in case of an accident. Carpet 44 x 52 inches. My only problem is that I move a lot and Linenspa gets confusing. That's why the larger size is good. It still covers the most important areas. I've only had it for a week, so I don't know if it's really waterproof yet. I washed and dried it before using it for the first time and it turned out great. I hope I have years to use it and probably get another one just like it. It's AWESOME Update 8/3/17: They are so AWESOME I've ordered a second one. You make my life so much easier :) Sleeping is not always easy when you are incontinent. I got up every 1/2 hour to go to the bathroom. Now, with extra padding in my adult diapers AND this Linenspa 44x52 waterproof sheet, I can relax. The waterproof film keeps the sheets underneath dry. Now, with the extra funds, I can make my entire bed at once instead of waiting for Linenspa to dry. I recommend this to everyone.
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