Filled with premium polyester fiber, our down alternative duvet inserts are out-of-this-world soft. This silky, high-quality fiber is designed not to clump over time and will give your bedding a lightweight, but luxurious feel that can't be duplicated. These down alternative inserts are also hypoallergenic, so even the most sensitive sleeper will be able to enjoy our top-of-the-line bedding. Duvet inserts have a 2.5 cm gusset and loops on all 4 corners making it easier to tie inside the duvet cover to avoid shifting.