I bought a 8 inch memory foam mattress and this topper at the same time. The mattress had that bad odor many people complain about and I was worried that even with the windows open I was not going to be able to deal with the smell for a few days. Then I opened the topper. The green tea minty smell was so much more pleasant than the natural smell of my mattress- it covered the sent. I've been using the topper for a couple of weeks now and it still has a faint minty smell which I notice every so often.