 harnesses years of mattress expertise to offer a truly elevated sleep experience the helix elite collection includes six different mattress models each tailored for specific sleep positions and firmness preferences if you're nervous about buying a mattress online you don't have to be helix has a sleep quiz matches your body type and sleep preferences to the perfect mattress because why would you buy a mattress made for someone else i took that helix quiz i was matched with the firm but breathable mattress