But Purple is in another league, argues Bernards. For one, it’s designed to prevent bedsores, so it’s a good bet for those who spend a lot of time under the covers. Purple uses a total of 16 patents to make its mattresses soft enough to hug your body, yet firm enough to hold you up through the night. And, should there be an apocalyptic event, you can eat them. The hyperelastic mattress material is made from a food-grade polymer — no latex or other toxic ingredients.