How to choose the right duvet — warmth, weight and season

Few things affect a night's sleep as directly as the duvet you sleep under. A duvet that is too warm leaves you sweaty and restless; one that is too cool makes you wake and pull your legs up. The right duvet does the opposite — it keeps you at an even, comfortable temperature all night long so that you hardly think about it. Choosing the right duvet is therefore not about finding the "warmest" or the "lightest", but about matching three things to one another: how warm you like to be yourself, how cool or warm your bedroom is, and which season you are sleeping through. In this guide we go through how the three factors interact, what warmth class and tog actually mean, and how you arrive at a duvet that feels right. We anchor the reasoning in two duvets from our own range — one down-filled and one fibre-filled — so that you can see what the choice looks like in practice. If you want to start with an overview, you'll find our whole selection in the Duvets collection.

The three factors: your warmth, your bedroom, your season

A good duvet choice begins with seeing the three factors as a whole rather than separately. They pull in different directions, after all, and it is the balance between them that decides.

How warm you like to be yourself

People regulate warmth very differently. A "warm sleeper" quickly gets too hot under a thick duvet and is best off with something lighter all year round, while a "cold sleeper" wants more insulation even in spring. Think through how you usually lie: do you kick off the duvet at night, or pull it right up to your chin? That is your most important clue.

How cool or warm your bedroom is

The bedroom temperature is at least as decisive as the duvet itself. Sleep Foundation states that most people sleep best in a fairly cool bedroom, around about 18 °C, because body temperature naturally drops as we fall asleep. A cool bedroom means you may need a somewhat warmer duvet; a warmer bedroom, or a room with underfloor heating, argues for a lighter one.

Which season it is

In Sweden, the indoor climate spans a wide range over the year, from mild summer nights to cold winter months. Many therefore enjoy different duvets for different seasons. We have written a separate guide comparing summer bedding and winter bedding if you want to go deeper into the seasonal shift.

Warmth class and tog — how it works

When you compare duvets, you often come across the terms warmth class and tog. Both try to answer the same question: how warm does this duvet keep you?

Tog is a unit of measurement for textile thermal insulation — that is, how well the material slows the flow of warmth from your body out into the room. By definition, a higher tog value equals better insulation and therefore a warmer duvet. As general guidance, the industry tends to divide the scale roughly like this:

• Low (cool duvet): airy and thin, suited to summer or to those who get warm at night.
• Medium (all-year duvet): a versatile middle ground that works for spring and autumn and, for many, all year round.
• High (warm duvet): insulating and cosy, intended for cold winter nights or draughty bedrooms.

Two things are worth keeping apart. First, tog says nothing about weight: a duvet can be very warm without being heavy, and vice versa. How heavy a duvet feels has more to do with the filling material and amount than with the warmth class itself. Second, tog is general guidance, not an exact rule — how warm a duvet feels is always affected by your bedroom and your own warmth regulation. Use the scale as a compass, not as a definitive answer.

The filling determines the character: down versus fibre

Alongside the warmth, it is the filling that most shapes how a duvet feels and behaves. The two most common families are natural down and synthetic fibre, and they have different strengths.

Down — light, soft and temperature-balancing

Down is known for an unusual combination: it weighs little yet insulates well and breathes at the same time, which makes it feel cosy without becoming stuffy. Our Sense of Satisfaction Down Duvet is filled with duck down and has a cotton shell. It gives that light, enveloping feeling that many associate with a premium duvet, and the cotton shell contributes a soft, breathing surface against the skin. If you want to understand the differences within down and feather more thoroughly, we have a dedicated overview on choosing a duvet and pillow in down and feather.

Fibre — allergy-friendly and easy to care for

Synthetic fibre is an excellent choice for those who want a durable, easy-care and allergy-friendly alternative. Our A Funky Dream Hotel Duvet is filled with siliconised fibre — fibres treated to feel soft and to keep their resilience and fluffiness over time. The siliconisation makes the filling supple and helps the duvet regain its shape, giving a hotel-like, even feel. For many households, fibre is also the practical choice in beds that see frequent use.

Which one suits you is less about "best" and more about preference: down for the light, natural sense of luxury, fibre for the allergy-friendly and uncomplicated. Both are gathered in our duvet collection.

Build the bed together — the duvet is part of the whole

A duvet never lives alone. How it is experienced is tied to the duvet cover, the sheet and any bedspreads. An airy duvet cover in natural materials lets the duvet breathe as it should, while a tighter weave can feel warmer. Think of the bed in layers: the duvet is the core, and the textiles around it fine-tune the feel. We have gathered the whole way of thinking in the guide on building the perfect bed layer by layer.

Once you have chosen the duvet, the next step is to dress it. Matching textiles in the right material make a difference both for comfort and for the overall impression — do explore our duvet cover sets to tie the bed together.

A simple path to the right choice

If you feel unsure, go through these steps in order:

• Start with yourself: are you a warm or a cold sleeper? That governs whether you should lean towards a lower or higher warmth class.
• Measure your bedroom: a cool room argues for a warmer duvet, a warm room for a lighter one.
• Think about the season: do you need a duvet for the whole year, or do you want to switch between a cooler and a warmer version?
• Choose the filling by feel: down for light, natural luxury; siliconised fibre for allergy-friendly and easy care.
• Fine-tune with textiles: let the duvet cover and duvet cover set make the final adjustment of warmth and expression.

With these five steps, the choice is rarely difficult. You are not looking for a perfect duvet in any absolute sense, but for the duvet that suits your particular warmth, your room and your season.

Frequently asked questions

How do I choose the right duvet?

Start from three things: how warm you like to be yourself, how cool or warm your bedroom is, and which season you are sleeping in. A warm sleeper in a warm room is best off with a lighter duvet, while a cold sleeper in a cool room wants more insulation. Then choose the filling — down or fibre — according to the feel you prefer.

What does tog mean on a duvet?

Tog is a unit of measurement for how well a duvet insulates, that is, how well it slows the flow of warmth from the body. A higher tog value means a warmer duvet. As general guidance, low values suit summer, medium values suit all year, and high values suit winter — but how warm it feels always depends on your bedroom and your own warmth regulation.

Is down or fibre best in a duvet?

Neither is objectively best — it depends on what you value. Down, as in our Sense of Satisfaction Down Duvet with duck down and a cotton shell, is light, soft and breathes well. Siliconised fibre, as in our A Funky Dream Hotel Duvet, is allergy-friendly, durable and easy to care for. Choose by preference rather than by a ranking.

Do I need different duvets for summer and winter?

Not necessarily, but many enjoy it. If your bedroom varies a lot in temperature over the year, it can be pleasant to have a cooler duvet for summer and a warmer one for winter. If you prefer simplicity, a versatile all-year duvet works well, especially if the bedroom keeps an even temperature.

What temperature should I keep in the bedroom?

Most people sleep best in a fairly cool bedroom, around about 18 °C according to Sleep Foundation, because body temperature drops naturally as we fall asleep. It is, however, individual. Bear in mind that the bedroom temperature and the duvet's warmth are connected: a cooler room may justify a warmer duvet, and vice versa.