When shopping for duvets, you often see the terms ‘hypoallergenic’ and ‘anti-allergy’, and may assume they’re interchangeable. However, they are actually very different. Hypoallergenic, or non-allergenic, means that the materials used are relatively unlikely to cause an allergic reaction. This doesn’t mean, though, that the manufacturer has applied any specific treatments to the duvet to prevent allergies. Anti-allergy, in contrast means that the duvet has been specially treated to prevent the development of dust mites, protect against dust-mite infestation, or both.

Microfibre duvets are a relatively recent addition to the market, but they aren't to be confused with hollowfibre. Microfibres are finer but don't have the hollow space that hollowfibre has. Instead, microfibre is intended to be a synthetic equivalent to down; its extra-fine fibres give the same feel. Washing at lower temperatures can dissolve the dust mite droppings that trigger most people's reactions, which will fix the issue temporarily. However, to kill the dust mites themselves, you need to wash at 60C or above. but the mites will survive, so it's not a long-term solution. Aim to wash your duvet every six months (bedding that sits against your skin covers – so sheets, duvet covers and pillowcases – should be washed weekly or fortnightly). Just to spell it out: any duvet that proclaims itself ‘anti-allergy’ but is not washable at 60C is no such thing. 2. Look for 'anti-allergy' rather than 'hypoallergenic' More than a third of Which? members surveyed choose feather and down duvets, making it the second-most popular option. These lightweight, cosy duvets retain heat well but still help you to avoid overheating. Plus, if cared for properly, they will last much longer than synthetic fibre alternatives.

The best kids’ duvets for 2023 are:

Some duvets come in 'four-seasons' or 'all-seasons' sets. With these you get one light duvet (usually about 3.5 tog) and one heavier one (usually about 10.5 tog). The light one will be enough in hot summer months, and the heavy one suits spring and autumn weather. When you need extra warmth in winter, you can combine both. Standard UK duvet sizes Microfibre: tightly woven and designed to keep all those pesky dust mites and airborne allergens out, microfibre is a go-to choice for seasonal allergy sufferers. Despite the compact nature of the fibres, microfiber is also light and breathable. However, it’s worth noting that hot sleepers might find they trap more body heat than other materials.

Feather/down duvets are also very popular, owned by around a third of members. Less popular types include wool, silk and other synthetic duvets. Hypoallergenic means that the actual material and filling of the duvet isn't made of a known potential allergen, like feathers or wool. But other allergens, mainly dust mites, can still develop on these types of duvets.You'll know your duvet is due for an upgrade when the filling becomes limp or uneven, or it starts coming through the casing. Often viewed as the height of luxury, silk duvets are naturally hypoallergenic and resistant to dust mites, and therefore ideal for people with eczema or asthma. Like wool, silk will help you stay cool in summer and warm in winter. Like all natural fillings though, they will need to be professionally laundered. Microfibre duvets: pros and cons It's one of the lightest and most supple fillings, meaning even a 14-tog microfibre duvet will feel light. Some people prefer this as the duvet won't feel heavy on you as you sleep, while others prefer a heavier, more closely hugging duvet. If you're not sure which you'd prefer, make sure you try them out in store before buying. Having the right duvet can help make the difference between a difficult night's sleep and a peaceful one. Just over half of our survey respondents had bought a new duvet during the past five years. Cons: More expensive than hollowfibre, has to be professionally laundered, some people can be allergic to the filling