First up, it's synthetic fillings. These duvets are filled with manmade fibres, like polyester and polymide that are made from petroleum-based plastics. 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. The tops are heat-generating, yet lightweight. This means that children will be able to keep hold of their body heat without feeling smothered. And as far as care is concerned, it couldn’t be simpler: throw them into the washing machine inside out and then straight into the tumble dryer. 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. Whether you're looking for a parka to withstand wintry dog walks or a pop of colour to brighten up the dark and dreary school run, we’ve found the best warm coats and cosy waterproofs, as well as some stylish faux fur and down coats too, as recommended by fashionable (and warm) Mumsnet users. Best winter coats for women 2023: at a glance

The best thermal underwear to buy in 2022 1. Smartwool Classic Thermal Merino Base Layer Bottom: Best thermal underwear overall Another solution is to opt for an 'all-season' duvet. This consists of two separate lighter tog duvets that can be joined together (usually by way of press studs) to make a warmer winter duvet. Most commonly an all-season duvet will include a 4.5 tog and 9 tog duvet that can create a 13.5 tog duvet once combined, or a 4.5 tog and 10.5 tog duvet that will create a warmer 15 tog combination. verifyErrors }}{{ message }}{{ /verifyErrors }}{{

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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. 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. As the days get shorter, darker and colder, we all inevitably start to rummage around in our wardrobes looking for extra layers to keep us warm. And while an extra jumper is the most obvious go-to once the cold hits, knitwear can be quite bulky and uncomfortable even when going about our day-to-day errands. However, there is a better option: thermal underwear. Available in six colours, you’ll easily find one to match just about any outfit. It also comes in a fantastic range of sizes, making this thermal suitable for just about anyone who needs an extra layer of warmth this winter. Although it will mean spending a little more, and may depend on your bed frame height and style, we'd generally advise sizing up with your duvet, especially if you sleep with a partner.

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. A slim fit means they’ll sit as comfortably under a school uniform as they will under a snowsuit for outdoor play. There are options to fit almost any age, from toddler to teenager. There are no colour options to choose from, but this isn’t a biggie when they do their job so perfectly.Obviously, 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. 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? This thermal top is a lightweight layer to keep you warm and cosy on particularly chilly nights. This long-sleeved layer has a slim fit, but stretch means it’s never uncomfortable. Made from a combination of acrylic, viscose and elastane, it’s brushed on the inside to give an ultra-soft feel against the skin. Using Heatgen Plus technology, this thermal top retains the heat that’s generated by your body. Its snug fit also means bulkiness won’t be an issue once you’ve added a second layer over it. 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.

Then there are the more traditional, natural fillingsto consider. These range from all types of feathers and down to wool filling.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. To help you get to grips with the basics, we've broken down the pros and cons of most common duvet fillings below. 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. Emily Attwood, founder of sleep-brand scooms agrees, ''We’d always advise a 9 tog to 13.5 tog for the winter months as this is ideal and will keep you warm. If your house is always on the warmer side, then a 9 tog duvet would probably suit you better throughout the winter months, and you wouldn’t want to go any higher. This will prevent you from overheating which can disrupt your sleep.'