Very firm. Hurt my neck and my back within the 100 nite trial. I thought I should give it a couple of weeks to "adjust". Big mistake! Went to chiropractor weekly for almost 2 months not realizing it was the mattress all alone. It's nothing as described. It's a traditional spring mattress and low quality. The edges/corners sink in super low simply sitting down by a 160lb person. There is hardly any memory foam on top, very thin layer. Extremely disappointed to have to deal now with their unprofessional company for return pick up. Zero communication. Wayfair was quick to process refund, the main reason we are going to continue to shop here. Always amazing customer service. The mattress? Not this one, not for us.