Designed with 2 slightly different foam rolls to allow different levels of support * Air circulates through pillow while relieving any pressure points * Urethane core is hypo-allergenic and covered with a soft solid white poly/cotton blend cover * Standard foam pillow has smooth surface * Convoluted foam pillow has eggcrate-type surface * This pillow does NOT compare to the Wal-Pil-O. The Wal-Pil-O is a 4-in-1 pillow that has been clinically proven to help reduce pain. Dimensions: 23 1/2 x 14 x 4 *