A good pillow is essential to a good night's rest! In addition to cradling the head and allowing all the tension-holding muscles in the neck to relax, our PrettyCool Pillow provides thermal regulation to the one area left exposed while we sleep. (and the head is highly sensitive to temperature fluctuations.) Our thermally regulated pillow holds the highest rating, provides full temperature regulation from every side, and is overstuffed to provide outstanding support for side-sleepers. This is the stuff dreams are made of!