MyPillow is the only Official Pillow of the National Sleep Foundation. MyPillow features a patented interlocking fill which adjusts to any sleep position. It adjusts to your unique curvature for an exact fit. It stabilizes your head, shoulders and neck for perfect support. You will go into REM sleep faster and remain there longer for more productive sleep. MyPillow creates a natural cooling effect and is 100% USA made. MyPillow features a 10-Year Warranty and a 60-Day Money Back Guarantee. MyPillow is completely machine washable and dryable.