John Lewis Natural British Wool Midweight Duvet, 6-9 TogMade in Lancashire with a 100% British wool filling, this midweight duvet has an equivalent tog rating of 6 9 tog. Wool is effective at temperature regulation and it's resistant to bacteria, so this duvet is naturally hypoallergenic and will help to keep your body temperature optimised throughout the night. It's encased in a pure cotton cover that's soft and breathable. Good to know As this duvet is made from natural materials, we recommend airing it