100% Polyester PERFECT FIT & SLEEP - Sink into deep slumber every night with the Serta Memory Flex Duvet Insert. Whether it's a warm summer evening or a chilly winter night, this fluffy duvet insert with a breathable design provides all-season comfort ODOR & STAIN PROTECTION - Our bedding comforters feature treatments to inhibit the growth of odors, keeping your bed fresh. Scotchgard’s wicking & stain release treatment helps keep you cool and clean, night after night comfort with day-to-day peace of mind QUALITY & COMFORT - Our down alternative comforter features a box quilted design to reduce shifting of the down alternative fill. This down alternative duvet insert evenly distributes warmth, softness and comfort to your bed every night WORRY FREE CARE - Our bed comforter is machine washable for easy stain and wrinkle maintenance. Machine wash cold separately on a gentle cycle. Only non-chlorine bleach when needed. Tumble dry on low. Do not iron. Use large front loading washer and dryer SERTA - A champion of comfort for all, Serta has pioneered sleep innovation for more than 90 years in more than 150 countries. From cooling sheets, soft yet supportive pillows and mattress accessories, Serta has everything you need to make a comfy bed