The best.
Everyone complaining about sunken mattresses should really look into getting the firm option, getting a better bed frame, or investing in a nutritionist. People shouldn't blame a well made mattress for lack of health choices and or lack of care for products. I have had this mattress in the firm option for 3+ years, weighing 125 pounds at 5'7" and partner weighing 210 at 6'2". The foam is in the exact same shape as when we first got it almost 4 years ago, the exact same great shape. It is an incredible mattress and I keep it in top shape with the bamboo mattress protector offered on this site as well. Highly highly highly recommend this mattress in the firm option specifically, you cannot beat the amazing quality for such an incredible price!