The Five Sided™ Smooth mattress protector helps prevent the development of asthma and features the laboratory-certified H2Pro® liquid-proof membrane on five sides of the mattress. With microscopic pores to allow air passage, the H2Pro® layer completely blocks liquids, viruses, dust mites and allergens. Unlike other bed protectors that sound like a plastic bag and don't cover the whole mattress, the Five Sided™ protector is quiet and includes the universal fit elastic ensuring a secure fit for mattress depths 6”-22”. • Formerly Sleep Tite Five 5ided™ OmniPhase™ • Top and side mattress protection • OmniPhase™ phase change material actively regulates temperature by absorbing and dissipating heat • Known for superior moisture-management properties, TENCEL™ Lyocell fiber aids in optimal sleeping temperatures • Proprietary fabric combination provides all-season comfort • Quiet and breathable laboratory-certified H2Pro™ membrane is liquid proof and dust mite proof • Fitted sheet design features Universal Fit™ elastic that ensures a secure fit for mattress depths 6 to 22 inches • 15-year non-prorated protector and mattress warranty when purchased on the same receipt