Beautyrest Cotton Top Mattress Pad Simmons Soft Cover Protector with Premium Fibers Expand-a-Grip Skirt Fits up to 15? (California King) Cotton Soft 100% Cotton face with polyester backing. Polyester Adjustaloft? fiberfill provides superior loft, support and resiliency than traditional fiber. Expand-a-Grip Deep pocket Skirt securely fits all mattresses up to 15" deep. Thread stitched quilting provides years of performance. Machine washable and dryable for easy care. Made in USA.