BEDGEAR iProtect PERFORMANCE Twin XL Mattress Protector, Breathable, Anti-Microbial, Waterproof Barrier. Fits mattresses up to 18 inches deep PERFORMANCE: Achieve more each day by providing maximum recovery at night. Protects against dust mites, stains, moisture, allergens and bacteria while wicking away heat and moisture to keep you cool and dry while you sleep LIGHT WEIGHT MATERIAL: ALLOWS FOR CONSTANT AIR FLOW WATERPROOF BARRIER: Invisible barrier back will not affect the feel of your mattress