IceTech cooling fabric Breathable waterproof barrier Blocks allergens and dust mites IceTech fabric continually dissipates body heat to create a cool sleep climate Laboratory-certified H2Pro® membrane is breathable and quiet Breathable fabric does not add bulk or change the comfort of a mattress Five-sided protection guards the top and sides of the mattress. Universal Fit design and thicker premium elastic creates a smooth, secure fit on mattress depths 6 - 22'