This 4 Channel Performance Density Pillow has a unique 2 in 1 hybrid construction that uses an innovative 4 channel top design pared with a premium micro bead fill, resulting in soft yet superior support. The micro beads in the 4 channel top conform to your head and neck. The reverse side, which has the traditional single chamber is filled with a blend of Tencel® and Lyocell down alternative fibers that keep your pillow cool. The cotton cover is a special fabric that wicks away moisture and dries rapidly. This pillow offers optimum firm support preferred by side sleepers.