10.5 Tog Duvet: The All-Season Middle Ground

Jun 12, 2026 / Oct 5, 2026 · 6 min read · togs bedding duvet tog-rating uk ·

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The rating UK retailers stock most

Dunelm lists more 10.5 tog duvets than any other rating: 40 when we checked on 5 October 2026, against 27 at 13.5 tog and 25 at 4.5 tog. That says a lot about where the UK market sits. Retailers treat 10.5 tog as the one-duvet answer for most of the year, and Primark calls it "the most versatile and best year-round coverage."

This guide covers what 10.5 tog means, who it suits, how the fillings compare according to Which?, and when an all-seasons set is the better buy.

What 10.5 tog means

A tog measures how well a duvet keeps heat in; the higher the number, the warmer. According to Wikipedia, one tog is 0.1 square metre kelvin per watt, so 10.5 tog is a little more than double the insulation of a 4.5 tog summer duvet.

Retailers place 10.5 tog at the top of the spring and autumn band and call it the all-season weight:

Argos: spring and autumn is 7.5 to 10.5 tog, which "can work year-round in mild homes", and all-season duvets "usually come in a 10.5 tog."
Silentnight: 10.5 to 13.5 tog "is ideal for autumn and winter."
Which?: a winter duvet is "10.5 to 15", though "most people find that a 13.5 tog duvet is warm enough for British winters."

One caution from Wikipedia applies to every rating: the number on a British duvet is "a minimum; actual values may be up to 3 tog higher." Our guide to how tog ratings are measured explains why.

Who it suits

A 10.5 tog duvet suits a bedroom that stays at a steady, moderate temperature overnight, which in practice means most centrally heated UK homes. The testing laboratory IDFL notes that while 13.5 tog is the most common rating in the UK and Ireland, "with increased usage of central heating, 12.0 and 10.5 togs are becoming more popular."

It suits warm sleepers who find a 13.5 tog stifling even in winter. Bensons for Beds puts the usual UK choice at "somewhere between 10.5 and 13.5 tog".

It suits two groups less well:

Cold rooms. Bensons warns that in the coldest months "a typically cosy 10.5 tog duvet barely takes the chill off a freezing night in the minus numbers." Our guide to the 13.5 tog winter duvet covers that step up.
Hot summers. Which? recommends "a low tog between 1 and 4" for the warmer months; see our 4.5 tog summer duvet guide.

Fillings compared

At 10.5 tog the filling decides weight, feel, price, care and lifespan. Which? tested 24 duvets with a panel of 40 testers, and its guide sets out the trade-offs:

Filling	What Which? says
Synthetic (hollowfibre)	"Sometimes cheaper", machine washable, some hypoallergenic; typically lasts "up to five years"; filling "can clump together"
Microfibre	A synthetic "designed to be a synthetic equivalent to down", and "one of the lightest and most supple"
Feather and down	Retains heat and prevents overheating; lasts longer than synthetics if cared for; most can be washed at home at 40°C or 60°C, but harder to dry
Wool	Similar price to feather and down; "naturally hypoallergenic and dust-mite resistant"; must be washed gently at a low temperature
Silk	"Naturally hypoallergenic and resistant to dust mites"; expensive and needs professional laundering

Which? also found that "the best synthetic duvets in our test scored just as highly for comfort as feather and down options, and in some cases surpassed them." Prices run from "as little as £20" to "more than £700."

Primark adds a point about weight: "synthetic fillings often require more material to match the insulation of a down duvet," so a synthetic 10.5 tog will usually be heavier than a natural one.

Light or heavy: how Which? judges comfort

Two duvets with the same tog can feel very different, and Which?'s testing reflects that. It buys "the bestselling duvets", accepts no freebies, and tests each one in king size. Each duvet "is rated by 40 testers for comfort and whether it's a suitable weight," and the results are split between "those who prefer a light duvet and those who prefer a heavy one." Each is also weighed, washed according to its care label and checked for defects afterwards.

The practical lesson for a 10.5 tog: decide whether you like a light or a heavy duvet before you choose the filling, since that preference matters as much as the number.

Sizes

UK duvet sizes vary slightly between brands. Slumberdown, for example, lists Single 135 x 200 cm, Double 200 x 200 cm, King 225 x 220 cm and Superking 260 x 220 cm. Silentnight gives a super king as 220 x 260 cm. Check the measurements on the product page against your bed before you buy.

Allergies: two different labels

If you have allergies, Which? draws a distinction worth knowing. "Hypoallergenic" means the filling is not made of known allergens such as feathers or wool, but dust mites can still develop. "Anti-allergy" means "the filling and casing will have been treated to resist and combat the development of dust mites," which may suit people with "asthma, eczema or rhinitis." Whatever you buy, Which? says dust mites are killed by "washing at temperatures of 60°C or above", so check the duvet can take that.

One 10.5 tog, or an all-seasons set?

The alternative to a single duvet is an all-seasons set. Which? describes the usual pairing: "one light duvet (usually about 4.5 tog) and one heavier one (usually about 9 tog)". The light one covers summer, the heavier one spring and autumn, and together they make a 13.5 tog winter duvet. It says these sets "often cost a bit more upfront," but are "usually cheaper than buying separate summer and winter duvets."

So the choice is simplicity against flexibility. One 10.5 tog duvet stays on the bed most of the year with no swapping. A set covers summer heat and winter cold better, but needs storage and the occasional changeover.

Caring for it

Which? says most duvets, including all the ones it tested, can go in a home washing machine, and recommends washing "once or twice a year". Silentnight suggests "every 6-12 months", with air drying in a well-ventilated space. Always check the care label first; a heavy or expensive duvet can go to the dry cleaner.

Where to buy

10.5 tog duvets are the most widely stocked rating. Dunelm lets you filter by tog, and Argos, Silentnight and Bensons all sell them. Compare the filling first, then the price. For a side-by-side of two value brands, see Silentnight vs Slumberdown, and for the full range of ratings, our tog rating chart by season.

In Britain "tog" means this warmth rating, but in Australia, New Zealand and Ireland "togs" means swimwear; see what does togs mean.