Sleep Philosphy 4" Gel Memory Foam with 3M cover mattress topper is wonderful! It provides a nice firm cushion to your mattress that makes it so much more comfortable to sleep. When I first initially opened and unrolled it, it had a strong scent to it, but the packaging let me know that odor would disappear after a day or two in which it did. I also like that it has the 3M cover mattress because with little kids I need the extra protection.