As an arthritis suffer I have struggled to sleep comfortably for ages. I wake up because joints are hurting and have difficulty going back to sleep. Well, no more. This mattress topper has made my day(night)! There was no chemical odor when I opened it and with just a few hours of leaving it spread out it was ready to use. Much more affordable than a memory foam mattress. I highly recommend this to anyone looking for a comfortable mattress topper.