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Standard Convoluted Pillow * 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 *