After a bad car accident and two spinal surgeries, the only way that I was able to sleep was on a Tempurpedic Mattress. I have had my mattress for apx 15 years. Recently, however, following a hysterectomy and major hormonal changes, after sleeping for about 4 hours I would wake up and felt like I was on a bed of hot burning coals. I had a ductless air conditioner installed over my bed in ADDITION to central air and had the thermostat set at 62. I was on fire, my husband was sleeping in a hoodie. I was searching for a new mattress that wouldn’t reflect my bodyheat. I stumbled upon the ChiliPad™ but was hesitant to spend so much money on a product I was unfamiliar with. Since they have a 90 day satisfaction guarantee I decided to give it a try. I AM THE HAPPIEST SLEEPER IN THE WORLD. No longer do I wake up after 4 hours of sleep. I sleep through the night, comfortable and cool. It took me a few nights to find my perfect temperature setting, as the first night I woke up freezing- YEAH better than hot coals. I simply raised the temp to about 73 and set the timer. I once again love my Tempur-pedic mattress and wouldn’t give my ChiliPad™ up for anything. I may even travel with it. Great innovation. My husband also thanks you, as he doesn’t have to wear the sweatshirt to bed anymore. :D