This down alternative 5.1 TOG duvet features a premium 100% polyester fill encased in a soft, durable polyester shell. It delivers perfect warmth in winter and exceptional softness in summer, making it your go-to comforter for year-round cosiness. BOX-STITCH DESIGN: Designed with a box-stitch construction that ensures the fluffy fill is evenly distributed for superior warmth and comfort. The Box-Stitch construction also better retains the duvet's shape after washing, preventing shifting. PRACTICAL DESIGN: Loops at each of the four corners and in the middle of each side keep the duvet insert from slipping inside its duvet cover. EASY TO CARE: Please gently fluff the comforter and let it rest for up to 24–48 hours after taking it out of the box to ensure maximum fluffiness. Machine wash separately in cold water on a gentle cycle and tumble dry low for a like-new restoration. This product contains 65% Global Recycled Standard (GRS) certified recycled polyester