Encase® LT Mattress Protector Full Total encasement protection that is soft, light and breathable comes from the Encase LT mattress protector. It protects against bed bugs, liquids, allergens and dust mites without changing the feel of your mattress. A breathable H2Pro® membrane allows air to pass while blocking fluids, bed bugs and allergens. This protector features a zippered end and fits mattresses up to 14 inches thick. L : 20.5 - W : 20.5 - H : 10.5 - W : 23