An all-season duvet is made up of two separate duvets of differing togs – one lightweight and one midweight – that can be attached together into one single heavyweight duvet or used separately. The idea being that you can mix and match to ensure you have the perfect weight duvet for spring, summer, autumn, and winter. The best summer duvets are lightweight and breathable, but they won’t give you that cosy warmth you’re craving during the winter. “I would not recommend duvets that are thin, have a poor-quality fill, or are made with linen fabrics, simply because they’re not ideal for the colder months” says Simba’s Mary Love. “You may find yourself shivering in the night!” Don't buy it if: you're on a tight budget as this luxury duvet has a luxury price tag. If you're a hot sleeper or suffer from night sweats then you might find down too warm; opt for a more breathable wool-filled duvet instead to avoid overheating. And, if you're vegan, then the feather and down fill won't be for you.

Pros: Sustainably made, versatile – this is the only duvet you’ll need to buy, offers year-round comfort, free, carbon-neutral 3 day delivery Pros: Eco-friendly, top quality, free standard delivery, naturally lightweight, supremely soft and snugglyObviously, it isn't always convenient to have a different duvet for each season, so the middle ground of the 10.5 tog duvet is one of the most popular options. OEKO-TEX Standard 100 verifies that a product has been tested for harmful substances. If a product carries the STANDARD 100 label you can be certain that every component (thread, button, zip etc) has been tested for harmful substances and is therefore harmless in ecological terms. GLAMOUR tested review: “It’s another fairly expensive number, but Emma often has big savings so look out for those throughout the year.” Emma Henderson. If you’re struggling to work out what the best tog duvet is to see you through summer heatwaves and plummeting winter temperatures then an all-season duvet could be the answer. GLAMOUR tested review: “I've just started using the All Seasons duvet and, honestly, I've never been more grateful to be able to take apart the 9.5 and 4.5 sections, depending on what the weather is. It's whisper quiet when you move around, the filling is well distributed and it even arrived in a handy storage case which I'm now storing 4.5 tog section in for next summer.” Mayola Fernandes

Pros: Affordable for a year-round duvet that promises to keep you cosy warm in the winter and cool in the summer. Customers are saying: “Not cheap but worth the money, our double duvet is lightweight but cosy and I love the adjustability and can feel the quality of the material”. We’ll be honest, this high-tech, innovative duvet system isn’t cheap. But it really does offer three luxurious duvets in one, meaning it’s the only one you’ll need, year-round. Here’s how: it comprises one 7 tog spring/autumn duvet and one 3.5 tog summer duvet. Cleverly, the two sections can be joined together with nifty corner snaps, ensuring they stay firmly in place within the duvet cover, and giving you an overall tog rating of 10.5 and keeping you perfectly warm in the winter months. Both sections boast a silky, patterned casing and the quality is palpable. Typical of the brand, the 3-in-1 duvet is made with strategic engineering: think Simba renew clusters and a Better Cotton cover with the brand’s Stratos cooling technology. This anti allergy duvet brags heat controlling properties too, and even when it’s doubled up, it proves surprisingly lightweight and breathable – ideal for hot sleepers that still need to feel cosy in winter.The temperature you see on the care label is the highest temperature the duvet can take, so it’s okay to wash it at a lower temperature to be kinder on your product and the planet. Running a prewash can help with heavily soiled linens and most modern detergents provide excellent results at low temperatures. Customers are saying: “So snuggly and warm but lightweight too, comparable to the down duvet I’ve had for years. A great product I wish I’d bought it sooner.”