Our Deluxe range of Duvet Inserts uses down alternative filling, which is carefully chosen for its quality and hypoallergenic properties. It doesn't matter whether the outside is cool or warm; it will keep you at a perfect temperature. The duvet insert has fill weights of 350 and 150 GSM, providing softness, warmth, and lightweight comfort. These breathable inserts are naturally grown and also relieve pressure during sleep due to their lightweight nature. You get two inserts in a box. One will be a 150 GSM summer/spring insert, and the other will be a 350 GSM autumn/winter insert. You can snap both inserts together using our proprietary method to make a 500 GSM winter duvet insert. You can customize your sleep experience all year round.