This is not a 6'' mattress! It's maybe 15'' inches. When I put the mattress on the bed frame and box spring. It's way too high. If I took the box spring away, the mattress is not firm enough. Otherwise, I need to change my bed frame. I try to return it, but Wayfair asked me to bring the item to FedEx! It's a heavy mattress and we don't have a truck. Our city doesn't have a FedEx office, only the onsite. Free return with many troubles, is not a real free return.