4.5 Tog Summer Duvet: Lightweight Options for UK Warm Months

The night the winter duvet becomes too much

A British summer does not give much notice. Bensons for Beds puts it this way: "a 13.5 tog duvet can be difficult to live with in the height of summer when temperatures can suddenly shoot up to 30°C or even more." That is the night most people start looking at a summer duvet, and 4.5 tog is the rating they usually land on. Bensons' own advice is that "a three or 4.5 tog duvet will give you the covered comfort you need in summer without overheating."

This guide covers where 4.5 tog sits on the summer scale, who it suits (including children), how the fillings compare, the all-seasons alternative, and what UK retailers were charging when we checked on 5 October 2026.

Where 4.5 tog sits on the summer scale

A tog measures thermal resistance: how well a duvet slows the loss of heat. One tog is 0.1 square metre kelvin per watt, according to Wikipedia, and British duvets are sold "in steps of 1.5 tog from 3.0 tog (summer) to 16.5 tog (extra-warm)." The lower the number, the cooler the duvet.

Every source puts 4.5 tog at the top of the summer band:

Which? is the odd one out. It suggests "a low tog between 1 and 4" for the warmer months, so you won't overheat on summer nights. That makes 4.5 the warmest of the summer weights: a sensible choice for most British summer nights, but if your bedroom stays very hot, a lower tog is worth a look.

One caution. The number on the label is a minimum. Bensons says a duvet "could, in fact, have a rating of up to three togs higher", and Wikipedia says the same. A 4.5 tog duvet may sleep a little warmer than its label.

Who a 4.5 tog duvet suits

Argos aims its summer band at "hot sleepers and warm bedrooms." Bensons adds a group who run warm all year: "those going through menopause, people on certain medications or folk who simply run hot." For them, a summer-weight duvet may stay on the bed for longer than the summer months.

It is not a year-round answer for most people. Bensons says that for most of the UK "a duvet of somewhere between 10.5 and 13.5 tog is the go-to", and that most people "will opt for two duvets per bed, allowing for a spring/summer and autumn/winter changeover." Primark calls 10.5 tog "the most versatile and best year-round coverage." Our tog rating chart by season sets out the whole scale, and the 10.5 tog all-season guide covers the middle weight.

4.5 tog for children

4.5 tog is also the rating retailers suggest for young children. Argos recommends 3 to 4.5 tog for toddlers, 7.5 to 9 tog for children aged 3 to 10, and a maximum of 10.5 tog under 10. Bensons says "young children are less able to regulate their body temperature than adults", so it recommends lighter tog duvets for toddlers and says "4.5 tog is ideal", with a blanket or warmer pyjamas added on cooler nights.

Babies are different. The NHS advice on reducing the risk of sudden infant death syndrome is to keep a baby's cot clear: "do not use pillows, duvets, cot bumpers, loose blankets, soft toys." Primark says the same in its tog guide: "It's not safe for babies below 12 months of age to use duvets." Our children's duvet tog rating guide goes into the age bands in more detail.

Fillings compared at summer weight

Which? sets out the pros and cons of each filling. For a summer duvet, these are the points that matter most:

Primark describes the two kinds of synthetic: "hollow fibres are thicker and tend to trap heat more easily, whereas microfibres are much finer and boast a soft and light feeling, much like a natural duvet filling." For a summer duvet that feels light, microfibre is the synthetic to look at. Primark also says natural duck feather and down keep you "cool during heat waves, while also allowing your skin to breathe."

Weight varies by filling, not by tog. Argos calls it "one popular misconception" that tog relates to weight; the weight is down to the filling. Which?'s tested Argos Habitat Duck Feather 4.5 Tog weighed 1.98kg in king size.

Washing a summer duvet

Which? says most duvets, including all the ones it tested, can be washed at home, and recommends doing it "once or twice a year." Silentnight recommends "every 6-12 months", and sooner after a spill. Feather and down duvets can be washed at home at 40°C or 60°C, Which? says, but "can also be more difficult to dry properly than synthetic duvets." Summer is the easy season for that.

For allergies, Which? says dust mites are killed "by washing at temperatures of 60°C or above", so check that a duvet can take it before you buy.

The all-seasons alternative

If you would rather buy one product than two duvets, an all-seasons set includes a 4.5 tog. Which? describes the usual set as "one light duvet (usually about 4.5 tog) and one heavier one (usually about 9 tog)": the light one for summer, the heavier one for spring and autumn, and the two combined for winter warmth. Bensons gives the example of a 9 + 4.5 tog set it sells, combining to "13.5 tog" when "things get really frosty."

Which? says these sets "often cost a bit more upfront" but are "usually cheaper than buying separate summer and winter duvets." The trade-off is weight in winter, covered in our 13.5 tog duvet guide.

What 4.5 tog duvets cost

Bensons notes that a higher tog duvet "will be a little more expensive than a lightweight summer duvet because they'll tend to contain more material." These were the listed price ranges for 4.5 tog duvets when we checked on 5 October 2026:

Prices change often, and they vary by size, so check the retailer before you buy.

A note on the word: in Britain, tog is this warmth rating. In Australia, New Zealand and Ireland, "togs" means swimwear, as our guide to what togs means explains. This page is about the bedding sense.

Where to buy

Dunelm has a 4.5 tog filter on its duvet listing, alongside filling and size. John Lewis sells its own synthetic and duck feather and down ranges at 4.5 tog. Argos links its 0 to 4.5 tog range from its duvet guide, and Marks & Spencer sells its All Seasons 3-in-1, which includes a 4.5 tog. For brands, see our Silentnight vs Slumberdown comparison.

References

• Bensons for Beds: What is a duvet tog and which tog do I need?
• Which?: Best duvets 2026, tried and tested for comfort and warmth
• Wikipedia: Tog (unit)
• Argos: Duvet and pillow guide
• Primark: Duvet tog guide
• Marks & Spencer: Duvet buying guide
• NHS: Sudden infant death syndrome (SIDS)
• Silentnight: Duvets
• John Lewis: Duvets
• Dunelm: Duvets