High-quality zipper: To avoid the zipper getting stick or dislodged when changing the mattress cover, we use the best zipper on this mattress protector. Also, the quality of stitches you can trust which will not popped and ripped. Perfectly Fit: Not too tight or too loose, just Perfectly fits Memory Foam Mattress which is up to 4 inches thick. 100% Waterproof Protection:The 6 sides with thick PU inside make sure your memory foam away from liquids spills. Six-Sided zipper mattress cover: Our zippered mattress protector completely encloses the mattress, acting like a protective layer over the top, bottom, and sides of the mattress. Easy Care: Machine wash in cold water with things in similar color; Tumble dry low; Do not bleach. Waterproof Low Profile Box Spring Encasement