It did not occur to me that there would be a period of adjusting to the memory foam topper. Once released from its wrappings, it was like watching it come alive. The slight odor lasted just a short while. The topper fit the mattress perfectly. Having a zipper cover is an excellent feature. Now I am sleeping wonderfully as all pressure points are encased in a soft cushion. This definitely lives up to its write up and has been a very satisfactory purchase.