I purchased this topper for my daughter ..and thinking to order 1 more for my bed also ... Helps her with having a good sleep. No unpleasant odor at all... This is a great mattress topper. worth every buck... It comes vacuum sealed all packaged up so when receiving all you do is unwrap and let the topper sit for a while and you are good to go ! I was very impressed with the quality of this Gel memory foam..