For several weeks, I had researched different mattress toppers for our over-sized queen bed which has a jell pad made into it. While the mattress, itself, is comfortable, the jell made it too warm for us. Then, I found the Joseph Abbound Dream Comfort Queen/King/Cal King Mattress Topper which is absolutely perfect. The sides of the mattress topper are deep and wide enough to snugly cover the sides of our mattress and securely remain in place. The topper completely covers the area of the bed allowing evenness, the materials used are of good quality, and the thickness of the topper blocks unwanted heat; plus, the comfort is unbelievable! What a great product and buy!