Pr1me® Terry Mattress Protector Olympic Queen The Pr1me® Terry mattress protector features a hypoallergenic and absorbent cotton terry 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. 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. L : 20.5 - W : 20.5 - H : 11 - W : 24