What makes the Purple® Hybrid Premier Mattress different from every other mattress? Simple: The Purple Grid™ – It took years and over 30 patents to perfect it. This unique 4” top layer adapts to your body and stays cool for superior comfort, support, and better sleep. Purple has added a new base layer of individually wrapped responsive-support coils to enhance the overall comfort and durability of the mattress. The combination of the Purple Grid™ and patented responsive-support coils augment the responsiveness and open airflow for even more adaptive cool, No Pressure® Support. The Purple Hybrid Premier 4” feels like zero gravity float.