I bought a double size Hypnia mattress in 2010. I loved it. It was suggested, in the store, that I twist it round once a month for 6 months then when required as hubby was very over weight and the mattress might suffer. I did as suggested and all was perfect. In 2020, 10yrs later, a friend was having back trouble with a new, well known brand, double mattress. She complained to the manufacturer but got nowhere. I changed my bed to a super king size bed and mattress in 2017 and put my double bed and Hypnia mattress in the front bedroom as a spare for visitors. I made the big mistake of offering to let my friend borrow it to see if it was what she needed with the idea of her buying one. I put her mattress temporarily in its place at mine. It's still there 8 months later and she has in fact paid me for the Hypnia and says how well she now sleeps and with little to no more back pain. My 10yr old Hypnia mattress! I am of course stuck with the one she didn't like and it's left with me as a spare. I was so upset she wanted to keep mine I got rid of my 3yr old super king size, cheap one anyway, and bought a new Hypnia super king size, online, to replace it. Only one more thing to say "I am in love again". Thank you "Hypnia" for your quality and customer care. If I could give more than 5* I would.