What a tog rating actually tells you The first frost of the year is usually when the question arrives. The heating clicks off overnight, the bedroom drops a few degrees, and a duvet that felt perfectly comfortable in October suddenly leaves a cold gap along one shoulder. The instinct is to reach for "something warmer" …

Picking a 13.5 tog duvet for a genuinely cold bedroom The decision usually comes down to one thing: a bedroom that gets cold overnight once the heating goes off. A 13.5 tog duvet is the standard UK winter weight, and for most people in an unheated or poorly insulated room it is the right call. But "13.5 tog" only fixes …