I have a problem with my waist and I need a mattress with an auxiliary effect. I deliberately used it for a while, and this time I finally found a mattress that really suits me. It may smell a little when it is opened, but it will disappear after a while. Comfort is very good, not too soft or too hard. Similar to adjusting the comfort level according to the change of sleeping position. Very good, my back will not feel sore when I get up. The price is right and the quality of the mattress is beyond my imagination.