What a disappointment. Shoulder pain, upper back pain, and hot. Mattress is cool when you climb into bed, but after a few minutes the mattress is getting very warm. This causes me to toss and turn. I bought this at a retail shop and can't return it so I'm stuck with a mattress that is hot and uncomfortable. I called S&F's customer support and told me to buy a cooling mattress topper. Oh joy, more money to spend to fix their crummy mattress design. Makes you wonder if they did product testing. Overpriced. This mattress may end up on curb.