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We explain how to choose the winter or summer duvet that really suits the way you sleep. The time of year is the starting point, but it doesn't decide everything: a bedroom with central heating doesn't need the same as a room in an old flat, and someone who always sleeps with a foot sticking out needs something different from someone who snuggles up to the chin.
Here you'll find out what fill weight means and why it's the figure that changes everything, how our 250 g, 450 g and 4 seasons duvets differ, and a chart to cross-reference your climate with the temperature of your home and clear up any doubts. By the end, you'll know which one is yours.
what you'll take away from this
- 1What fill weight is and why more grams doesn't always mean better sleep.
- 2When to use 250 g, when to use 450 g and who the 4 seasons is designed for.
- 3How to cross-reference your climate with the actual temperature of your bedroom to get it right first time.
- 4How to make the seasonal switch and store the duvet so it keeps better.
what fill weight is and why it decides everything
Duvet fill weight is measured in grams per square metre and basically tells you how much fibre is inside. More grams, more warmth. So far, so easy.
What often trips people up is thinking it's best to go for the highest number just in case. And that's the mistake, because a duvet that's too warm for your room doesn't mean better sleep: it means waking up at three in the morning with the duvet at the foot of the bed. That wake-up interrupts your sleep just as much as the cold does, only from the other end.
The ideal fill weight isn't the highest, it's the one that suits your room.
So the useful question isn't "how warm is it?" but "how much warmth do I need?". And the answer depends on three things: the season, the temperature of your bedroom at night and how you are as a sleeper. Let's look at all three.
Why hollow fibre keeps you warm without weighing you down
Before the numbers, something that helps make sense of them. Our duvets have a microfibre outer and a siliconised hollow fibre filling: each filament has air inside, and it's that air that insulates, not the weight of the piece. That's why a 450 g duvet is very warm without making you feel squashed.
The siliconised treatment makes the fibres slide over each other instead of tangling, and you notice it every night: it stays fluffy instead of clumping in the corners and it's breathable, so it helps body moisture escape.
Fluffy and light
It keeps you warm with the air inside it, not with weight. Comfort without feeling weighed down.
Breathable
It lets body moisture out, which helps the bed stay dry.
Certified
OEKO-TEX® AITEX, an independent laboratory, tests it for substances harmful to health.
250 g, 450 g or 4 seasons
We have three options and each has its moment. Here they are, from least to most warmth.
Spring and autumn
Winter nights
120 + 250 g
The 250 g: the most versatile in the wardrobe
It's the in-between-season duvet, the one you use in spring and autumn without a second thought. But pay attention to this, because it's what surprises people most: if your bedroom is heated or well insulated, this is your duvet in the depths of winter too. Lots of people buy the 450 out of habit and end up sleeping with the window open in January.
The 450 g: for when it's really cold
This is the one for those nights when you're glad to get into bed. It's designed for unheated bedrooms, old homes with little insulation or inland areas where winter really bites. If you're someone who sleeps with the window ajar all year round, it's yours too.
The 4 seasons: two duvets in one
This needs a proper explanation, because it's not a fill weight but a system. The 4 seasons is two separate duvets, one of 120 g and one of 250 g, which you can use separately or fastened together. And those three combinations cover the whole year:
| How you use it | Fill weight | When |
|---|---|---|
| Thin layer only | 120 g | Summer and mild nights |
| Thick layer only | 250 g | Spring and autumn |
| Both fastened together | 370 g | Winter |
If you don't fancy having two duvets taking up wardrobe space and swapping them every season, this is the most practical answer we have.
cross-reference your climate with your bedroom
Here's the useful part. The season gives you a clue, but the decision comes from cross-referencing two things: where you live and the temperature of your room at night. This chart sorts it out.
| Your area | Heated | Unheated |
|---|---|---|
| Mediterranean coast | 250 g | 250 g |
| Mild inland | 250 g | 370 g (DUO) |
| Cold inland or north | 370 g (DUO) | 450 g |
| Mountains | 450 g | 450 g |
Notice something striking: the 250 g appears far more often than people expect. With heating, half of Spain sleeps perfectly well with that fill weight in winter. The 450 is for genuinely cold conditions, not for "winter" in the abstract.
And then there's you
The figures above set the framework, but your body does the fine-tuning. These three cases are the most common:
You sleep hot
If you stick a foot out, throw the covers off or wake up overheated, go down a step from what the chart says. It's more comfortable to add a throw on the odd night than to be too warm every night.
You feel the cold
If you go to bed in socks, go up a step. The fluffy weight of hollow fibre gives you that feeling of being snugly tucked in without the bed feeling heavy.
There are two of you and you don't agree
The classic. The solution that works best is the 4 seasons: whoever feels the cold sleeps with both pieces fastened together for part of the year and the other doesn't notice the change, because the warmth is spread across the bed.
why the 4 seasons is often the answer
If you've got this far and you're still unsure, there's a reason the 4 seasons is the one we recommend most: it saves you having to decide today what your winter will be like.
With a fixed fill weight duvet, you're putting all your eggs in one basket. If you go too low, you're cold in January; too high, and you sleep uncovered. With the two-piece system, on the other hand, you adjust as you go: a cold snap arrives and you fasten them together; February turns out mild and you stick with the 250 g. And in summer you use the thin 120 g piece, which is just the minimal layer you want when it's hot but you don't want to sleep with nothing.
In numbers: it gives you three fill weights for the wardrobe space of one (well, one and a half) and saves you buying a second duvet. For anyone living in a mild inland area, where winter varies most, it's the option with the least room for error.
Remember the duvet needs its cover
The duvet is the piece that keeps you warm, but you don't see it: it goes inside a duvet cover, which carries the colour and print. The advantage of this system is twofold: you choose the warmth on one hand and the design on the other, and you can change the print whenever you like without touching the duvet. And if you'd prefer a single printed piece that goes directly on top of the bed, then what you're looking for is a comforter: we have them in 300 g, a fill weight designed for the cold months.
how to make the seasonal switch
You've got your fill weight. Now, three practical tips so the duvet keeps better and the wardrobe changeover isn't a drama.
When to switch. There's no date on the calendar, there's a signal: when you've been throwing the covers off for several nights, it's time to go down a fill weight; when you get up looking for an extra blanket, it's time to go up. That's your reference, better than the month.
Air it before storing it. Before putting the duvet in the wardrobe, leave it spread out on the bed or hung up in the shade for a day. It's a one-minute gesture that avoids a musty smell the following year.
Store it uncompressed. No vacuum bags: hollow fibre needs its air to keep its volume, and compressing it for months reduces its warmth. A breathable cotton bag, or simply folded on a shelf where it can breathe, is best.
And yes, it can be washed at home
It's one of the advantages of fibre over down. You need a washing machine large enough for the piece to move freely, a gentle programme and a moderate temperature. No fabric softener, as it makes the fibre clump and takes away exactly what you want from it. When drying, shake it from time to time so the filling regains its volume.
three fill weights, eight sizes and no surprises
We design and make in Spain, and that lets us take care of what you notice with use: that the duvet stays fluffy, that the microfibre doesn't rustle when you turn over and that it keeps its volume for longer. Our duvets are breathable and go in your washing machine. No dry cleaning and no down.
designed and madein spain
siliconised hollow fibrefluffy and light
OEKO-TEX® Class Iand breathable
now you know your fill weight
In short: look at the actual temperature of your bedroom before the month on the calendar. With heating, the 250 g will see you through almost the whole year. Without heating and in real cold, the 450 g. And if your winter is changeable, go for the 4 seasons without hesitation: it covers all three situations with a single purchase.
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