This is the single greatest purchase I've ever made to improve my sleep... worlds better than even my $2,500+ Stearns & Foster mattress... too good to be true for just over $100! I had back problems for years and thought buying an expensive mattress might help, but it didn't... sore back continued, shoulders ached, and I usually didn't sleep through the night. Maybe it was because I bought a medium firm mattress when I should've gotten something softer because I'm a side sleeper and have shoulder and hip points that need to sink in instead of rest on top of a hard surface... but laying this foam topper over my existing mattress fixed everything. If only I would've bought it sooner before paying for all those chiropractic and massage appointments to heal what I just assumed was my aging body, but certainly not my expensive mattress. This particular foam doesn't seem to sink down too much and trap me a hole like some memory foam mattresses I've tried at furniture stores, such as Tempurpedic... it just cushions my bony hip and shoulder points, gently fills in the gaps elsewhere, and makes me feel like I'm sleeping on a cloud. Pretty much every woman I've taken to bed since purchasing this topper has told me I have the most comfortable bed they've ever slept on.When I got the topper, it smelled a little chemical-ly, so I left it outdoors over some chairs in the summer most of the day. It's pretty heavy, so you might need 2 people to not only drape it over chairs, but put on the bed. It also adds some height to your current bed, so you might need to get deeper fitted sheets. I already had fairly high volume sheets for my Stearns mattress that's at least 12" inches high (15" with the topper added) and I still have to pull down like crazy to my fitted sheet under the mattress. I also use a bamboo cooling mattress pad above this foam which adds another inch, which I need because I'm a very hot sleeper and like way cooler temps to sleep in than most people... the mattress pad also helps lock this big blue foam in place and keep it's 4 points aligned to the edge of my mattress, though the foam topper is heavy enough on it's own to probably stay put. I also pair this topper with an Indulgence side sleeper pillow. The other secret ingredient to my good sleep is that I use blockout shades (NOT light filtering shades) over all the bedroom windows to keep it pitch black so I never know the difference between night and day, and don't get naturally awaken when the morning sun pours in. If you have back problems or trouble sleeping through the night, give this Sleep Innovations 3 Inch Cooling Gel Infused Memory Foam Mattress Topper a try. A hundred bucks is a small price to pay for better sleep every single night. You might want to flip it around every 3-6 months to keep it fresh, just as people sometimes rotate their mattress, particularly those who sleep in the same spot every night. When you first get it, it might take a week for some to adjust to its feel, but I was already used to it after a couple days. My blue topper is still going strong after 2 years, but I might buy an extra one soon to have on hand when this one's life has run its course, just to have a back-up in case the product is discontinued, because I've never found any store-bought cushy mattress topper that comes close to the orthopedic benefits of this one and I've never had as many sleep-through-the-night moments in a single year since childhood.