 If you're nervous about buying a mattress online, you don't have to be. Helix has a sleep quiz. It 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. I love it. My wife loves it. We are big Helix fans at the Shapiro household. Helix has a 10-year warranty. You can try it out for 100 nights risk-free. They'll even pick it up for you if you don't love it, but you will.