Very disappointed with our mattress purchase. Have the first week my wife and I both woke up with back a shoulder pain. I called Helix asking to return the mattress and they offered us a free topper and told us the mattress needed a bit of time to break in. After taking a few weeks to get the topper and then another few weeks to give the mattress to break in we are still very disappointed and wake up sore most days. We believe that helix will do anything to delay and avoid getting you to return a mattress. I feel like the sleep day guarantee is really just a marketing gimmick. I wish I would have been able to return the mattress when I first called to do so. We are already looking for a different mattress. Do yourself a favor and go to a traditional mattress store and test them out before you buy.