I aired this out for a day outside before putting it onto my bed because I had problems with other foam toppers. It really didn't need it, there was very minimal odor. The first night I slept on it there was a very slight scent, but it was not in the least problematic more like a "new" smell. When I woke in the morning, both my husband and I had much less joint pain. It was like sleeping on a cloud. I have hot flashes at night and was concerned about it being too hot. Turns out it was not an issue at all. Between the gel and the airflow there was no temperature difference than sleeping on my regular mattress without it. The only down side is my mattress is a deep one and when adding the foam my sheets don't fit. Not a problem, either get sheets that are deeper or use what I call sheet garters. There are a pack of four that clips on to each corner and slips under the mattress to hold the sheet on. Other than that I would highly recommend this topper! Very pleased with my purchase!!