Duvets are normally rated in "togs" - 15 being really warm. Doesn't the wool duvet give an equivalent tog rating to it's stated weight to area figures?
Have just discovered that a 500gsm wool duvet is equivalent to "11 to 14" tog - so this would be better for winter use- unless you heat the bedroom to 25C of course!
Quote:
"The warmth of a wool duvet is not measured in togs, because it is so adaptable. The best guide to use is weight. A 500gsm wool duvet is considered suitable for use in cold weather, but may not have such good drape as a slightly lighter duvet. A 400 -430gsm wool duvet is suitable for most weather, and can be adapted to the coldest weather with the addition of a light throw. A light-weight duvet (200-250gsm) is suitable for warm nights"