This bamboo 3” memory foam mattress topper is just as stated. It comes rolled up in a box and takes a bit of time until it totally inflates. It will enhance any mattress with a too firm feel. My daughter, who is a stomach sleeper, did not care for the sinking feeling she got while she slept, so we took off the topper. On the other hand, I am a backside sleeper, who likes a less firm mattress (pillow top is perfect for me) and I am still debating if I like this topper or not. Will keep for guests who like a softer mattress.