The pillow with a magic number: 37.5.
There's no "cool side" to the Temperature Regulating Pillow, featuring 37.5® Technology, but that's because it's designed to help balance your temperature, keeping you in your ideal comfort zone, longer. Polyester Versatelle® fill is designed for breathability and temperature consistency. This pillow uses innovative 37.5® Technology to help keep the microclimate next to your skin at the ideal relative humidity of 37.5%. The result? Reduces the effects of temperature-induced sleep disruptions, leading to longer, more restful sleep.