1. Choose pure white goose down with a loft of 500+. There shouldn't be any feathers in a good duvet. Feathers are heavy and have quills which will poke through the fabric. Down clusters are light and airy, and do not have quills.
More importantly, make sure it's approved by the Down Association (in Canada it's DownMark and the label will be sewn into the product.) This ensures that the manufacturer is accurately stating the contents of their products on their labels. All of our products are certified, so when we say 'pure white goose down', you know that's exactly what you'll be getting.
2. The shell should be a high enough thread count to prevent leaking and noisy crunching. We recommend anything above 300+ Thread Count, preferably in a cotton satin. The softer the shell, the more light and airy the duvet will be. (Keep that in mind when purchasing your duvet cover too.)
3. The construction should be baffle box (not channels) to prevent clumping. You want to make sure the down is evenly distributed so there are no cold spots. (Tip: Fluff your duvet when you make your bed everyday to keep it looking great.)
To learn more about down, visit our Down Product guide.