I'm using this to extend the life of a mattress for a about a year. It is overwhelming when you first open it. Others have noted the smell, true, and it took me about a week to air it out. NOTE: One bit of info that may be important. Mine was probably a return, it was not in its original packaging, but it was not used. Certain parts of the topper were yellowed, although that occured only along the edges. Research revealed this is due to oxidation of the material, and not a flaw or something worse. My sleep is improved and it is quite comfortable. NOTE: This four inch topper is actually about two inches of memory foam and two inches of standard foam material. Overall, a good value.