Our deluxe range of wool duvet inserts uses wool from Merino Wool, which is hand-selected and has full farm provenance. It doesn't matter whether the outside is cool or warm, it will keep you at a perfect temperature. The comforter/duvet insert has a fill weight 200, 300 & 500 GSM which makes soft, warm and lightweight duvet inserts. These are breathable inserts that are naturally grown and also relieve pressure during sleeping because of its lightweight nature. You get two inserts in a box. One will be a 200 GSM summer/spring insert and the other 300 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 all year round.