The mattress is comfortable and I sleep well on it but it holds all of the heat. I will wake up in a sweat nearly every night. I purchased it in September so I thought it was just too hot in my apartment but now through winter it has remained so hot at night despite my room being around 62 degrees. I sleep with just a sheet and I've even started sleeping with the window open. Im looking into a cooling topper or something but if you are a warm sleeper Id definitely find another option. I purchased the 13" but that wasn't an option to select.