Enjoy a perfect night's sleep with Hungarian Goose Down All Seasons (9 + 4.5 Tog) Duvet. With a 9 Tog for spring and autumn and a 4.5 Tog for the summer, you can combine the two duvets to make a 13.5 Tog for the winter. With poppers around the edge of each duvet keep both duvets securely together within your duvet cover.