This mattress is absolutely amazing. I have arthritis and so comfort is difficult to obtain – this is the best mattress I have ever slept on. It feels firm at first but totally supports and accommodates any position. I am so delighted with this investment in my own health and well-being, a fantastic product with innovative options enabling customisation to your personal requirements. I’ve gone for the UNIX-X Firm/Med/Soft/Soft and I totally love it.