I received this gel mattress topper and l let it air for 3 1/2 days before putting it on my bed to remove the odor. I suppose I could have used it prior to then, but I wanted all that smell to leave completely. Prior to this, I purchased a Slumber Solutions non-gel 3 inch foam mattress, and it held on to body heat. This gel topper id not hot and it is so comfortable. It feels heavenly, like being embraced by clouds of pillows, if you can imagine that.