LINENSPA Zippered Encasement Waterproof, Dust Mite Proof, Bed Bug Proof, Hypoallergenic Breathable Mattress Protector - Twin XL Size Thin, quiet waterproof barrier protects all six sides of the mattress from fluids and spills - vinyl free materials are safe for kids. Machine washable encasement has a zippered closure for a comfortable secure fit on mattresses up to 12" deep Fully encases your mattress with a smooth, lightweight fabric to form a reliable barrier against bed bugs, dust mites and allergens Soft, breathable fabric creates a cooler, more comfortable sleep surface - no crinkling sound or plastic feel Twin XL size mattress protector measures 39" x 80"; 10-year warranty