This would be a 5 star item but it had a definite odor that lasted over a week. Not unpleasant, but it was there. We love the degree of support. This is the 4th topper we've had, counting ones at the lake place. Love it, and it sure is a less costly way to go compared to the "Brand Name" memory foam. Also like that this is exactly the size of the mattress under it. We received this at around noon, and slept on it the very first night. It flattened out and then 'puffed up' in less than 4 hours.