Encase® HD Mattress Protector Split Queen The patented Encase® HD mattress protector offers complete encasement protection from bed bugs, dust mites, and liquids. Its laboratory-certified Micro Tite® zipper closure is bed bug proof and allows for easy removal as the top half zips completely off. Also laboratory-certified, the H2Pro® membrane creates a quiet, liquid-proof and breathable barrier against allergens, dust mites, and liquids. Pillow protectors are available to create a healthy sleeping environment. L : 21 - W : 21 - H : 17 - W : 45