Twin Size Zippered Mattress Cover Vinyl Keeps Out Bed Bugs & Dust Mites Water Resistant Protector 10" Wide 75" X 39" Vinyl Fits Twin Size Mattress , Please meaure height of mattress before purchase otherwise you will rip the cover if mattress is too small Keeps Mattress Fresh & Clean Fits Up to 10" in Height , 75" x 39"- 10" Height is maximum please measure first Keeps Out Bed Bugs & Dust Mites, Mildew & Mold Resistant Heavy Duty Vinyl Water & Stain Resistant