To know which mattress is really the best, Purple Mattress designed the Human Egg Drop Test to determine their mattresses comfort and support. As a part of the test, a man named Billy is hung from the ceiling with raw eggs attached to his back. When he falls onto the Purple Smart Comfort Grid, the raw eggs are perfectly intact. With a regular memory foam mattress, the eggs don't have the same luck. Purple Mattress says its mattresses provide support to your entire body and get rid of back pain no matter your body type, sleeping position or frequency of nightmares.