This is not my first memory foam topper. My husband and I sleep on a CA. King deluxe pillow top mattress. Our previous memory foam topper was only 2 inches thick and was comfortable to me, but my husband wasn't happy. After doing a little research I found that the recommended thickness for my husband's height and size (he is 6 ft. 3 inches tall) was 4 inches thick. This topper made a world of difference for him! It is literally like sleeping on a cloud, and now we both are sleeping blissfully through the night!