Brand IWACOOL net 1000g Filled with high - quality down, which is known for its excellent thermal insulation properties. The down clusters can trap air effectively, providing exceptional warmth while remaining lightweight. This makes the duvet perfect for keeping you cozy during cold nights without feeling heavy or bulky. Thanks to the natural structure of down, this duvet offers an outstanding warmth - to - weight ratio. It can keep you warm in winter with less filling compared to other materials, ensuring a comfortable and not overly stuffed sleeping experience. Crafted with durable stitching and fabric, the duvet is designed to last. The down is evenly distributed and secured within the duvet to prevent shifting and clumping over time, maintaining its loft and warmth - retaining capabilities for years of use.