BTW, I first heard the word "duvet" as a teenager watching British comedy on PBS. I had to look it up in the dictionary.
I find them annoying in hotels though, where the rooms are usually pretty warm. They use relatively thin inners but they're still usually way too hot for the conditions.
They quickly gained traction (Ikea probably had a big role there) and now both alternatives are common, although I'd say maybe duvets are already the most common.
The Spanish words for duvet and duvet cover (edredón nórdico, funda nórdica) are a testament of the fact that they used to be a foreign thing, here associated (I don't know if accurately or not) with the north of Europe.
I know a lot of places aren't as into complete climate control as we are around here, so it makes sense that those places would have different priorities when making bedding choices, now that I think about it. Thanks for sharing.
Outside temperature range round here is maybe -6°C to 24°C
I don't know what standards the RoW uses, but we have a TOG rating here for our duvets ... we have a 4 for summer, and 13 for winter.
https://en.wikipedia.org/wiki/Tog_(unit)
https://en.wikipedia.org/wiki/Climate_of_Scotland#Temperatur...
Someone should make a map colour coded with this.
https://www.yahoo.com/lifestyle/why-millennials-aren-apos-t-...