The patented "Encase® HD" mattress protector offers complete protection against bed bug infestation, dust mites, and liquid spills. Its laboratory-certified "Micro Tite®" zipper closure is bed bug-proof and allows for easy removal as the top half fully closes. It has also been laboratory-certified that the "H2Pro®" membrane creates a quiet, liquid-proof, and breathable barrier against allergens, dust mites, and liquids.