Wrap yourself in plush warmth with this Premium Cooling Down-Alternative Duvet Insert from Threshold?. This midweight duvet insert is made from 100% lyocell fabric shell filled with a polyester fiber-lyocell blend filling. It has a box-stitched quilting to keep the fill evenly distributed throughout and secure corner ties to hold your duvet in place. Plus, the cooling pouch absorbs excess heat to keep you comfy. Threshold?: Looks like home, feels like you.