The ultra-thin Original Performance mattress protector features a breathable, smooth performance stretch fabric surface that sleeps comfortably and will not change the feel of the mattress.<br />Ultra-lightweight and stretchy, the performance fabric gives you the ventilation and protection you need without the bulk. It protects and breathes at the same time while keeping quiet to eliminate distraction while sleeping.The liquid-proof membrane creates a quiet, and breathable barrier against allergens and dust mites while allowing for airflow and mattress TOP + 4SIDE PROTECTION.<br />QUIET. COOL. Protection with Sleep*Tech(R) Technology for Constant AIR FLOW.