Each Slumber Fresh Pillow is luxuriously filled with RELY™ fiber that inhibits the growth of known allergens such as mold, mildew, fungus and the odors they cause in the pillows for longer lasting freshness. Cover is 400-thread count (thread count) cotton with self-corded sides. Thread count (thread count) is the number of threads per square inch of fabric-the higher the thread count, the softer and more durable the material. 100-percent polyester fill. Machine washable. King pillow measures 36 inches long x 20 inches wide Queen pillow measures 30 inches long x 20 inches wide Standard pillow measures 26 inches long x 20 inches wide.