Each duvet series comes with 3 standard fill weights, namely Summer, All Seasons and Winter, to suit users with different warmth preferences. A higher fill weight would provide more warmth. Please refer to the fill weight chart under each product for more fill level details. If you had a down duvet before, you could use it as a reference point to find a comparable duvet. If this is your first down duvet, feel free to contact us for recommendations or explore your best down duvet options by taking our Down Duvet Quiz. If you have specific fill level requirements that differ from our standard fill weights, we are happy to work with you to provide a more personalized solution.