[This review was collected as part of a promotion.] This mattress is very thick, we found that we did not need a box spring because this mattress is so thick and tall, we set it right on our frame making it the perfect height. The mattress is medium firmness, but the pillow top layer makes it so much more comfortable, it is like laying on a cloud. There is no more waking up and rolling around to get comfortable at night, no more aches and pains in the morning, this mattress helps keep me asleep and feeling refreshed in the mornings. Often at night there are times of being way to hot and sweating, however not while on this mattress, with its cooling technology we said goodbye to hot sleeping and hello to comfort. One thing that would be recommended is to buy a king size mattress protector as it fits perfect on this mattress since it is so thick. So glad that there is now comfort in our sleeping and more waking up refreshed and well slept.