With easily interchangeable, color coded cores based on firmness levels, the Double Core Select is the most versatile foam pillow on the market. As you become accustomed to each level of support you will likely crave a firmer support. Start with the white core, the softest and most accommodating and gradually work your way up to the gold core, the firmest and most supportive. Fits a standard pillowcase. Washable cotton/polyester cover included. 22x16 inches with 4 inch lobes. Color-Coded Support Levels Black Core: Firm Support White Core: Gentle Support Gold Core: Extra-Firm Support Blue Core: Medium Support Item Description FOM172 Double Core Select Cervical Pillow. Care instructions: Pillowcase: Wash in cool, soapy water. Tumble or line dry. Pillow: Wipe foam with a damp cloth air dry.