I have been dealing with chronic achilles tendonosis for 2 years due to posture and hip issues. I am a triathlete and have been through PT, orthotics, and the like. While all of these have helped improve things a bit, it wasn't until I started sleeping on my new mattress that the pain and swelling are literally gone!! My back apparently was not being supported fully by my former mattress (Casper) but I never gave it much thought. Incredible!! I am thrilled with it and feel like a new person, no longer hobbling down the stairs in the morning. I'm wayyy too young for that!!