I have for sale a queen-sized Helix Sleep mattress (https://www.helixsleep.com/). This mattress was set up to be firm. It was always used with a mattress pad by one person for about 4 months, sheets and mattress pad laundered weekly. It has been used less than 5 times since April. It is currently in storage in a smoke-free, finished basement wrapped in a plastic mattress protector. This really is a great mattress - I loved it - but I don't have a need for it anymore.The retail price of this mattress is $900.