I LÒVE this memory foam. I am disabled, I purchased a bed that has the controls to raise or lower the bed. The showroom model had an amazing memory foam built into the mattress. However, the bed that was delivered was nowhere similar to the comfort of the one at the store. They let me change it 1 time. Its still hard as a rock! 4200 for a rock hard bed. I spend a lot of time in the bed due to my ailments. I need comfort. I bought this 4 memory foam and Im in heaven. I wake up feeling rested. I can stay in bed all day and be comfortable. I LOVE this product and highly recommend it.