The Pr1ME smooth surface of the Sleep Tite PR1ME Smooth Mattress Protector is quiet, breathable, hypoallergenic. Best of all, it won't change the feel of your mattress, so your bed will still feel like your bed. Its lab-certified H2Pro membrane allows easy airflow but repels liquids, dust, and allergens, and its vinyl-, PVC-, and phthalate-free construction is perfect for asthma, eczema, and allergy sufferers. The thick elastic keeps the mattress cover tight with no bunching of shifting, and it fits mattress depths up to 22 inches.