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A plump white duvet folded at the foot of a neatly made bed with soft morning light across layered bedding

Bedding

Duvet Warmth Explained: What Tog Means and How to Read Fill Power and Fill Weight

Tog rates how a duvet holds heat; fill power and fill weight describe the fill. Here is how the three numbers fit together, and how to match a duvet to the season.

September 29, 2026

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