Prime Mattress Protector The Prime™ mattress protector features a hypoallergenic and a breathable, smooth fabric surface that sleeps comfortably and will not change the feel of the mattress. It also features the laboratory-certified H2Pro®liquid-proof membrane which creates a quiet, and breathable barrier against allergens and dust mites while allowing for airflow. The universal fit elastic ensures a secure fit for mattress depths of 6"-22". Pillow protectors are also available to create a healthy sleeping environment. Thin, smooth surface Breathable and 100% waterproof Allergen and dust mite proof Liquid-proof yet breathable Light, smooth polyester fabric with a breathable weave will not change the feel of your mattress Laboratory-certified H2Pro liquid-proof membrane is quiet and breathable Universal fit elastic ensures a secure fit for mattress depths 6”-22”