My son's mattress is firm. Being on a limited budget, we can't afford a brand-new mattress, so we did the next best thing and bought him a mattress topper. The first one (another brand) started out well but weeks later it proved to not be very good. So, I went on the hunt for a new mattress topper for my son. I found this one and decided based on the price and reviews to give it a shot.This has made all the difference! It's very thick, soft, and fits his twin XL perfectly. My son no longer tosseSee full review