Indulge in a night of deep sleep with the ultimate head and neck support! Our Serta Won't Go Flat Pillow offers both softness and support for any sleep position. Made from exceedingly soft, durable and lightweight 300 thread count cotton fabric that will retain its softness wash after wash. Our king size pillows feature stain release technology for easy stain removal in the wash. Allergen barrier weaving prevents dust irritants and other household allergens. Machine wash cold, gentle cycle. For best results, use a front loading machine. Wash with like colors only and use non-chlorine bleach when needed. Run spin cycle twice, for maximum water extraction. Tumble dry low heat with clean tennis balls. Remove promptly and fluff after drying. Do not iron. A champion of comfort for all, Serta has pioneered sleep innovation for more than 90 years in more than 150 countries. Every Serta bed is designed to provide superior comfort, including the award-winning Perfect Sleeper and iComfort collections.