FOR EXTRA COMFORT - We recommend that you try  to place another pillow underneath the CPAP pillow,  this will give the memory foam pillow more "height",  which will provide more support Comfort for Side, Back, & Stomach Sleepers to Reduce  Face & Nasal Mask Pressure & Air Leaks Soft enough for instant comfort but firm enough to  promote neck and spine alignment. No more over-tightening your mask to compensate for  your pillow pushing it off your face causing air leaks One size fits all, easily use a standard pillowcase or our free custom cover -