How to Choose a Duvet

You notice a duvet most when it gets it wrong — kicked off at 3am because you're too hot, or pulled tight because you're cold. Getting it right comes down to four things: the tog that sets its warmth, the fill inside, the weave that lets it breathe, and how you keep it clean. Match those to how hot you sleep and the seasons you sleep through, and the rest is detail.

Start with tog — how warm you sleep

Tog is the number that matters most, and it measures warmth, not thickness. A low tog lets heat escape and sleeps cool; a high tog traps it and keeps you warm. As a rough guide, around 4.5 tog suits summer and anyone who sleeps hot, 10.5 tog handles spring and autumn, and 13.5 tog holds heat through winter. The common mistake is going warmer than you need — if you routinely wake up too hot and throw the duvet off, drop the tog rather than reaching for a heavier one. Hot sleepers should err lower across the board.

Fill — natural, synthetic, and what it means for you

What's inside the duvet shapes how it feels and how you care for it. Natural fills — down and feathers — are light, drape softly, and breathe well, wicking moisture away so you sleep cooler; the trade-off is more careful washing and, for some people, allergies. Synthetic microfibre mimics that softness, washes easily at home, and is kinder to allergy-prone sleepers, though a dense synthetic can trap heat unless the weave is built to breathe. Neither is better in the abstract — natural for breathability and lightness, synthetic for easy care and allergies. Pick for the priority that actually keeps you up at night.

Weave and breathability — the hot sleeper's real lever

For anyone who sleeps hot, breathability does more than the tog number alone. A duvet's weave and construction decide how freely air and moisture move through it, which is why two duvets at the same tog can feel very different at 3am. Breathable cotton casings and open, airy constructions let body heat escape instead of banking it under the covers. Some duvets are built specifically to sleep cool, pairing a low tog with a weave that moves heat away from you. If waking up hot is your problem, treat breathability as the headline feature and the tog as the supporting one.

Coverless or traditional — how you'll wash it

Duvets split into two kinds by how you dress and wash them. A traditional duvet needs a separate cover that you change and launder like the rest of your bedding — flexible, since you can swap colours and wash the cover often, but it's another step and another thing to keep. A coverless duvet skips the cover entirely: the outer is the finished surface, and the whole thing goes in the wash, which is simpler and quicker to keep fresh. If laundry is the chore you most want to shrink, coverless has a real edge; if you like changing the look of your bed, a traditional duvet and a drawer of covers gives you that.

Get the size right — and don't forget the pillow

Two last things decide whether a duvet actually works on your bed. First, size up: choose a duvet a size larger than your mattress so it drapes over the sides instead of leaving a cold gap where the heat leaks out — a double duvet on a double bed often feels mean once two people pull at it. Second, your duvet is only half the sleep equation; the pillow under your head decides just as much, especially the support your neck needs in your usual sleeping position. If you're sorting your bedding properly, see our best pillow for side sleepers decision alongside this one.

Ready to choose

Once you know how hot you sleep, which fill suits you, and how you'd rather wash it, you can judge any duvet on what matters: tog, fill, weave and care. When you want the specific recommendation — our top pick for hot sleepers, plus the alternatives for instant cool-to-the-touch relief and for cooler shoulder-season nights, and who each is wrong for — see our best duvet for hot sleepers decision, and read how we test to see what our picks rest on.