Indulge in a world of deep sleep with lightweight fabrics so soft, and filling so fluffy, that you won’t believe it’s not down! The Serta Down Illusion Collection brings a world of marshmallow goodness to your sleep chamber, clouds turned into a cozy reality. This cloud-like mattress topper brings an extra layer of cushioning and protection to your bed. Our down alternative mattress topper features advanced treatments to inhibit the growth of odors, keeping your bed fresher, cleaner and more durable. Allergen Barrier Weaving prevents dust bugs and other household allergens. Effortlessly stretches to grip any mattress and prevent your mattress topper from shifting during your sleep. Fits like a glove to never slide. Allow 24-48 hrs after unpacking to reach full fluffiness. A champion of comfort for all, Serta has pioneered sleep innovation for more than 90 years, bringing quality products to more than 150 countries worldwide. Every bed across the Serta portfolio is designed to provide superior comfort, including the award-winning Perfect Sleeper and iComfort collections.