A tog rating is only given as a general comparison. Wool duvets are sold by the gram weight of wool per square metre and are warmer than equivalent polyester or feather tog rating gram for gram. And therefore a lighter weight can be used. At the same time it will be cooler giving a greater range of months of the year for use.
Baavet Duvet – Light Weight
A duvet which is most suited to the warmer months of the year and is suitable for people who prefer less weight on the bed or who suffer from night sweats.
This is a lighter wool duvet with a filling of 300-350gms of wool per m/2. Similar to 4-8 tog rating.