My daughter has Spinal Muscular Atrophy, and uses a trach. The heated circuit from her vent makes her already hot body run even hotter. In addition, she recently developed eczema. To try to prevent pressure sores, she has a memory foam topper on her mattress, which makes it unbearably warm. Nights were horrible; she was sweating and not getting any comfortable sleep. We switched from a waterproof pad to this, and while she still runs very warm, I think it was the factor that changed our nights from sleepless to restful, finally. I'm actually on here to buy a second one for her bed!