I would give this 0 stars if I could. I purchased a king sized hybrid Simba and after 1 year I started hating how uncomfortable and firm it is. If you want to sleep on a rock this is the one for you. 2 years later and I'm still stuck with it because I can't afford a new one. Simba doesn't respond regarding warranty or refunds. I'm not suffering from sever back, neck, shoulder and hip pain. (I'm 30.) I'm not that old that I should require the chiropractor 2 times a week and a massage 1 a week plus a prescription drug for the pain I'm having. This mattress is horrible for your body. The word needs to be put out there that it shouldn't even be considered as a purchase for anyone! I'm telling you, it seems great at first but after a few months your body is going to hate you. I have reached a point where I don't even look forward to going to sleep at the end of the day. I dread it. I wake up in pain and exhausted from not being able to sleep. Sleeping in my car or on my rug would be better then this heep of trash they call a mattress. Please for the love of god... Pick any other mattress and don't even think about this one.