This unique and thoughtfully designed wool filled pillow case will add comfort and purity to your existing pillow. Simply put this pillow case over your pillow and avoid a large investment buying a new pillow. Eliminates the overheating and night sweats common with down, feather and synthetic fills and foam. Makes your sleeping surface 100% natural and chemical-free. Experience the countless benefits of wool. Blocks off gassing from your current pillow. Increases REM sleep.