I like to do research prior to buying anything. That "homework" payed off here, for sure! I learned that the heavier you are, the higher density you need in a memory foam mattress. We are both over 200#, so just zeroed in on the 4 # density mattress toppers. Definitely wanted one that wouldn't make us too hot sleeping on it, so researched that and learned that the memory foam w/ gel was good to keep things cooler...so that became a must, too. Wanted the sheets to fit over it, so decided 3" thick should do well. That narrowed down the search...and after reading all the reviews, we decided that this baby was THE ONE for us! Delighted that lack of odor was mentioned in the reviews, too. That was a "bonus", in my opinion! The homework payed off...we LOVE this mattress topper! I have a feeling that we will be ordering another one for the guest bedroom very soon, too. Put your priorities in order and stick to them...you'll be VERY glad that you did. Happy shopping!