Twin Size Zippered Mattress Cover Vinyl Keeps Out Bed Bugs & Dust Mites Water Resistant Protector 75" X 39" New and Improved Now 12" Wide Fits Twin Size Mattress , Mildew & Mold Resistant - New Improved Size Keeps Mattress Fresh & Clean, Keeps Out Bed Bugs & Dust Mites 75" x 39" - Now Fits Up to 12" in Height for easier fit on most mattresses Please measure your mattress Before Purchase, It's always good to leave a bit extra space Heavy Duty Vinyl Water & Stain Resistant