Read more in our guide to what tog duvet to buy as well as finding out when is the right time to switch to a summer duvet. What size duvet do I need? First up, it's synthetic fillings. These duvets are filled with manmade fibres, like polyester and polymide that are made from petroleum-based plastics.

After much testing, we think 13.5 tog is best tog duvet for winter, with most of our testers finding 15 tog can retain heat a little too much during the night and lead to overheating.If you're a hot sleeper or suffer from night sweats then you might also find this high down-mix fill too warm; opt for a more breathable wool-filled duvet like Floks Luxury British All Seasons Wool Duvetinstead to avoid overheating. Buy it if: you're looking for luxury as well as warmth. No duvet fill feels quite as sumptuous as down, and this Soak & Sleep Hungarian goose-down option is one of the best quality we've come across. It's super warm yet lightweight, drapes beautifully on the bed, and feels super luxurious – you'll instantly feel like your bedding has levelled up. The all-seasons option also offers brilliant versatility; use the 4.5 and 9.0 duvets separately in warmer seasons and combine to create 13.5 togs of winter warmth. If you’re going to invest in a more expensive item, it's worth considering the cost per wear and how long the coat will last. Sometimes the phrase ‘buy cheap, buy twice’ does ring true. How should a winter coat fit? That said, personally, we think 13.5 tog remains one of the best winter duvet weights, with some finding 15 tog can retain heat a little too much during the night and lead to overheating.

Then there are the more traditional, natural fillingsto consider. These range from all types of feathers and down to wool filling.Although you can get duvets in almost any tog rating, the most common togs are 4.5 tog which makes a great summer duvet weight, 10.5 tog which tends to be the best bet for autumn and spring, and 13.5 tog which offers good winter warmth. Spend some time looking for a new duvet and you'll soon realise there are a whole host of duvet fillings available. From hollow fibre to goose down, synthetic to natural, the array of terms and materials can fast become a little overwhelming.

Don't buy it if: you really want to layer on the warmth. This 13.5 tog duvet is plenty snuggly enough, but we think the wool and down options just pip it to the post in terms of cosiness. That said, this synthetic option is far easier to care for as it's machine washable and can be tumble dried on a low heat setting. Long thought of as the Holy Grail of duvet fillings, down creates a plump, squishy and super soft duvet.However, that luxury feel comes with a luxury price tag to match.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. The new incarnation of the popular Microlight is made with recycled materials and is a good all-rounder from the Rab stable – it’s light, warm, very breathable and available in a clutch of different colours. And if you’re in the market for ethically sourced animal down, Rab is a good brand to shop with. The highest tog duvet you can buy is usually 15 tog, although we have seen some all-season duvets (where two separate duvets of differing togs are combined into one warmer duvet) offering a combined warmth of up to 18 tog.

Buy it if: you're looking for luxury as well as warmth. No duvet fill feels quite as sumptuous as down, and this 90% Hungarian goose-down and 10% goose feather option is one of the best. It's super warm, drapes beautifully, and feels super luxurious. The all-seasons option also offers brilliant versatility; use the 4.5 and 9.0 duvets separately in warmer seasons and combine when the evenings start to drop in temperature to create 13.5 togs of winter warmth. Plus, although it's an investment, the all-seasons design means you'll also be kitted out with cooler tog duvets for spring, summer and autumn. Usually consisting of a long-sleeved t-shirt and leggings-style bottoms, a thermal underwear set is made from a soft material that’s able to retain heat. A good set of thermal underwear is comfortable, lightweight, and will keep you warm all day – even if you’re out in the blistering cold. Buy it if: you want an affordable winter duvet that still feels both warm and luxurious. This recycled polyester fill duvet has 10% silk mixed in, and whilst the proportion doesn't sound huge, it really makes a difference to the way this duvet feels, with a more luxurious touch and really nice drape on the bed, whilst still being lightweight. Even better it's a relatively budget buy, and made from certified recycled polyester from waste (like plastic bottles or manufacturing off-cuts) which helps the movement towards a more circular economy by reducing waste going to landfill. Compared with virgin polyester, recycled polyester helps conserve crude oil reserves during fibre production. There are two main considerations when shopping for thermal underwear. It’s important that this innermost layer fits like a second skin and that it’s made from materials that won’t irritate. This may sound daunting, but it’s easy to find thermal underwear that meets both your needs and your budget. Below we explore the key considerations when purchasing good-quality thermal underwear, while also listing the best thermal underwear available to buy now.Why you can trust Ideal Home Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out more about how we test. To help you get to grips with the basics, we've broken down the pros and cons of most common duvet fillings below. verifyErrors }}{{ message }}{{ /verifyErrors }}{{ 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.