The Duvet Insert (Winter Weight) is Baffle Stitched with a Down Alternative fill. It's oversized so it will not shift when placed in the Lili Alessandra Duvet Cover. For down duvet lovers who suffer from allergies or asthma, our premium down-alternative duvet could be the perfect addition to your room. Made of synthetic material, down-alternative filling provides relief from allergens commonly found in traditional down inserts.