This goose down duvet is made with care in Canada with Canadian fill. The shell is 500 thread count cotton - soft and quiet. The shell is filled with 850 loft goose down farmed by Hutterites in Alberta, Canada. Down fill is soft and luxurious, made up of tiny, fluffy clusters. The fill is very high loft, which means it is high quality and very warm per ounce. This is why you'll find this duvet is very lightweight. Just a little bit of fill goes a long way in terms of warmth! Opt for Regular Weight if your room temperature is around 19 - 21 degrees C or if you're fairly warm when you sleep. All Season Weight is best if your room temperature is 16 - 18 degrees C or if you're a cooler sleeper.