I have used various memory foams for years and find this pad to be one of the better ones, particularly for the money. It is important to buy a heavy wight pad 4-6 lbs if you really want to get the support and effect of the memory foam. I have found that putting this pad on the top of a firm mattress makes it a perfect sleeper. I have tried 3-4" pads and find that they are too thick and you sink too far in thus minimizing the comfort. You will not be disappointed with this pad. If you are then you may want to plan on spending a lot more money.