So like all the other reviews, you will not get a 4" mattress topper. It's about 2 inches of foam topped with less than 1 inch of padding (like a quality mattress protector). So you're basically getting a 2" foam pad with a protector layer. It is comfy and it has helped some, but I would just buy a plain foam topper because that's all you're really getting for twice the price.
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