Tog Rating for duvets?

[Chz]

I like to go up a size on duvets to stop the drafts.

We get ours from Primark. They're cheap and we only use them in winter so are reluctant to spend much on them.

Oh this, for sure. Queen sized duvets on the double beds. The winter duvet is down, because the mrs loves the feeling of weight. Can't stand it myself and want the spring synthetic back.