The Hydrologie Pillow is being marketed as the "coolest pillow & cover."
There are few people who are unfamiliar with the desire to have a cool pillow and have to flip it over in order to avoid the heat that pillows tend to absorb from people's heads. Sleeping on a cool pillow, especially in warmer months, is much more comfortable than having to toss and turn in the heat. Hydrologie was designed with materials that prevent it from getting too warm -- reducing heat retention while increasing ventilation. The resulting bedroom item functions as a sleep aid that makes relaxing in the heat a little easier to endure.
The Hydrologie Pillow was created out of an almost universal preference that has not yet been specifically targeted by other pillows of its kind.