My waist has not been good, and I have been trying to find a firmer bed to improve my sleep quality, so I aim for a medium hard and hybrid mattress.I have used this mattress for almost 2 months. This mattress provides sufficient support and comfort. I'm about 200lb, but I don't feel any significant slump while sitting or lying on the bed, and it doesn't feel as stiff as a wooden chair when you are on the bed.This mattress uses memory foam on the top and individual pocket spring on the bottom, I See full review