12 Tog vs 13.5 Tog Duvet: Which Warmth Should You Choose?
If you're torn between a 12 tog and a 13.5 tog duvet, the honest answer is this: choose 12 tog if you sleep warm, run hot at night, or want one duvet that works for most of the year, and choose 13.5 tog if you feel the cold easily, sleep in a draughty or unheated bedroom, or want the deepest warmth for the coldest UK nights. We've spent years reviewing sleep products and reading the research on bedroom temperature, and this is one of the most common bedding questions I get asked.
The good news is that the difference between the two ratings is smaller than most people think, and once you understand it, the right choice takes about thirty seconds to make.
- 12 tog is the year-round middle ground - it suits warm sleepers and average UK winters, and it's the duvet many households never swap out. The Linens Limited Double Duvet 12 Tog is a solid, made-in-the-UK option.
- 13.5 tog is the UK's standard winter duvet - most bedding experts recommend it for cold nights, and it's the pick for cold sleepers. The Slumberdown Warm Winter Nights 13.5 Tog is the one I'd start with.
- Warmth runs about one step apart - tog measures how much heat a duvet traps, so 13.5 tog holds noticeably more than 12 tog, but the gap is nowhere near as big as 4.5 tog vs 13.5 tog.
- Can't decide between them? Buy the all-seasons option - a Silentnight All Seasons 3-in-1 Duvet combines 4.5 and 10.5 tog layers that fasten together to make 15 tog, covering every season in one purchase. Alternatively, the Simba Hybrid Duvet 10.5 Tog is a single all-season duvet with heat-regulating Stratos technology.
📚 Suggested Reading: Duvet Tog Ratings Explained · Best Summer Duvets UK 2026
Here's the part that usually surprises people: neither rating is "better" in any absolute sense, because they're built for different sleepers. A tog is a measure of thermal insulation - how well a duvet holds your body heat in and keeps the cold out - so the number is only meaningful against your own body temperature, your bedroom, and the season.
In this guide I'll break down exactly who each tog suits, compare them honestly across warmth, weight and cost, and give you a simple rule for choosing between them.
What the Numbers Actually Mean
Think of tog like a coat's insulation rating: a light spring jacket is a low tog, a thick winter parka is a high one. UK duvets typically run from 4.5 tog up to around 13.5 tog, which is about the thickest and heaviest weight you'll commonly find, according to bedding brand Dormeo via T3. A 4.5 tog is a summer duvet, 10.5 tog covers spring and autumn, and 13.5 tog is the standard winter weight.
That puts 12 tog in an interesting spot: it's the in-between rating. It's warmer than a 10.5 tog all-season duvet but not as heavy as a 13.5 tog winter duvet, which is exactly why it divides opinion. Some retailers sell it as a year-round option, and some sleepers find it perfect for winter while others find it not quite warm enough.
If you want the full background on how tog ratings work, our duvet tog ratings explained guide covers the science in detail, including how your core temperature naturally drops by about one degree during sleep.
The 12 Tog Duvet, Deep Dive
A 12 tog duvet is the choice for people who sleep warm, for mild-to-average winters, and for households that want one duvet to do most of the year's work. It traps plenty of heat on a cold night, but it's less likely to make you overheat and throw the covers off at 3am.
On Mumsnet, one thread on tog ratings sums up the real-world pattern neatly: households describe a 12 tog duvet as the one that "seems to serve us all year through", while a 13.5 tog is reserved for the coldest winter nights.
A 12 tog duvet is also noticeably lighter and easier to manage than a 13.5 tog, which matters if you swap duvets between seasons or wrestle with the cover on laundry day. It's the smarter pick if your bedroom stays reasonably warm overnight, if you share the bed with someone who runs hot, or if you'd rather add a blanket on freezing nights than swelter under a heavy duvet all winter.
The Linens Limited Double Duvet 12 Tog is the option we'd start with, and the Beautiful Dreams 12 Tog Duvet is a solid budget alternative.
Made in the UK with an easy-care polycotton cover, this is the 12 tog duvet I'd put on a bed for someone who sleeps warm. It's machine washable, comes in all the standard UK sizes, and the fill is a soft hollowfibre that keeps its loft through repeated washes. If you want the same warmth on a tighter budget, the Beautiful Dreams 12 Tog Duvet is a capable alternative.
The 13.5 Tog Duvet, Deep Dive
A 13.5 tog duvet is the UK's go-to winter duvet, and for good reason: it's built to keep you warm when your bedroom drops towards 10-15 degrees Celsius. Most bedding experts recommend 13.5 tog for cold winter nights, as Ideal Home notes in its winter duvet guide. If you're someone who feels the cold, sleeps with cold hands and feet, or lives in a house where the heating goes off overnight, this is the weight that stops you waking up shivering.
The flip side is real: 13.5 tog can be too warm for people who run hot. A duvet that's too warm interferes with your body's natural cooling during sleep, which can mean night sweats, restless legs, and waking up feeling groggy. If you've ever thrown a winter duvet off in the middle of the night, a 13.5 tog is probably not for you - and honestly, a 12 tog will serve you better.
This is the 13.5 tog duvet we recommend most often for cold sleepers. It's thick, cosy and soft-touch, with a hollowfibre fill that traps heat well without feeling stiff, and it's machine washable. If you want a more luxurious hotel-style feel at the same warmth, the Silentnight Hotel Collection 13.5 Tog is the premium option.
12 Tog vs 13.5 Tog - Head-to-Head
Here's the honest comparison across every factor that matters when you're deciding:
| Factor | 12 Tog | 13.5 Tog | Winner |
|---|---|---|---|
| Warmth | Middle weight, good for mild winters | Standard winter warmth, noticeably warmer | 🥇 13.5 Tog |
| Best for | Warm sleepers, year-round use, mild bedrooms | Cold sleepers, unheated or draughty rooms | Depends on you |
| Weight and feel | Lighter, easier to manage and wash | Thicker and heavier, more of a "hug" | 🥇 12 Tog (ease) |
| Season range | Autumn, winter and spring, with blankets in a cold snap | Winter only for most people | 🥇 12 Tog |
| Overheating risk | Low to moderate | Higher if you sleep warm | 🥇 12 Tog |
| Typical price (double) | Around £25-50 | Around £30-60 | Similar |
| Best product | Linens Limited 12 Tog | Slumberdown 13.5 Tog | Depends on you |
The headline finding? The two duvets sit about one warmth step apart, so the deciding factor is almost always your own body temperature, not the products themselves. If you wake up sweaty under a heavy duvet, drop to 12 tog. If you wake up cold at 4am, step up to 13.5 tog. That single question settles the argument faster than any spec sheet.
The All-Seasons Alternative
The honest trade-off with buying a single tog duvet: if you pick 12 tog you'll probably want a lighter one in summer, and if you pick 13.5 tog you'll definitely want one. If you'd rather not store two duvets, an all-seasons duvet solves the problem in one purchase.
The Silentnight All Seasons 3-in-1 Duvet is two duvets that fasten together: use the 4.5 tog layer alone in summer, the 10.5 tog layer in spring and autumn, and both layers combined to make 15 tog for winter. It costs a bit more upfront but replaces two or three separate duvets, and it's the option we recommend to anyone who can't decide between 12 and 13.5 tog in the first place.
If you don't want a layering system, a single 10.5 tog duvet with heat-regulating technology is another way to cover most of the year. Simba's 10.5 tog hybrid uses a Stratos cover designed to manage temperature passively — warmer in winter, cooler in spring and autumn. It won't replace a dedicated 4.5 tog summer duvet or a 13.5 tog winter duvet, but for UK bedrooms that stay above 15 degrees, a 10.5 tog all-season duvet is often the one that never leaves the bed.
If you tend to wake up sweating, go 12 tog or lower. If you tend to wake up cold, go 13.5 tog or higher. And if you're genuinely unsure, buy the Silentnight All Seasons 3-in-1 - it covers every outcome and you'll never be wrong in any month of the year.
Which Should You Buy?
Buy a 12 tog duvet if: you sleep warm, your bedroom stays above roughly 16 degrees Celsius in winter, you share the bed with a hot sleeper, or you want one duvet that works for most of the year. The Linens Limited 12 Tog is my pick here, with the Beautiful Dreams 12 Tog as the budget option.
Buy a 13.5 tog duvet if: you feel the cold easily, your bedroom drops towards 10-15 degrees Celsius in winter, the heating goes off overnight, or you simply love the weight of a heavy duvet. The Slumberdown Warm Winter Nights 13.5 Tog is where I'd start, and the Silentnight Hotel Collection 13.5 Tog is the premium upgrade.
Buy an all-seasons duvet if: you can't decide, you don't want to store multiple duvets, or you share the bed with someone whose temperature preferences are the opposite of yours. The Silentnight All Seasons 3-in-1 covers all of it. Whatever you choose, pairing the right tog with the right room temperature matters more than the duvet itself - our ideal room temperature for sleep guide explains why, and the bedding care guide will keep your new duvet lasting longer.
FAQ
Is a 12 tog duvet warm enough for winter?
For most UK bedrooms, yes - a 12 tog duvet handles average winter nights comfortably, which is why many households run one all year. You only need to step up to 13.5 tog if you feel the cold easily, sleep in a draughty or unheated room, or wake up cold in the small hours.
What is the difference between 12 tog and 13.5 tog duvets?
The difference is roughly one warmth step. Tog measures how well a duvet traps heat, so 13.5 tog holds more body heat than 12 tog. In practice a 13.5 tog duvet is thicker and heavier and is built for cold winter nights, while a 12 tog duvet sits between a 10.5 tog all-season duvet and a 13.5 tog winter duvet.
Is a 13.5 tog duvet too warm for most people?
It can be if you sleep hot or your bedroom stays above roughly 18 degrees Celsius. A 13.5 tog duvet is the UK's standard winter weight and most bedding experts recommend it for cold nights, but people who run warm at night often end up throwing it off. If you sweat easily, a 12 tog duvet is usually the better fit.
Which tog duvet is best for someone who sleeps hot?
A 12 tog duvet is the safer pick for warm sleepers, and a 10.5 tog or 4.5 tog duvet works even better in milder months. A duvet that is too warm raises your core temperature and makes it harder to stay in deep sleep, so warm sleepers should always drop a tog rather than add one.
Can you use a 12 tog duvet all year round?
Many UK households do - a 12 tog duvet works for autumn, winter and spring, and in summer you can swap to a 4.5 tog duvet or just use the 12 tog with the cover folded back. If you want one duvet that genuinely covers every season, an all-seasons duvet that combines 4.5 and 10.5 tog layers is the smarter buy.
Final Verdict
After years of covering bedding and answering reader questions on this exact choice, our bottom line is simple: let your own body temperature decide. If you sleep warm, buy the 12 tog. If you sleep cold, buy the 13.5 tog. And if you genuinely can't tell which you are, buy the all-seasons duvet and let the seasons answer for you.
The Linens Limited Double Duvet 12 Tog is the best 12 tog option in our comparison for warm sleepers, and the Slumberdown Warm Winter Nights 13.5 Tog is the best pick for cold sleepers. If you go the all-seasons route, the Silentnight All Seasons 3-in-1 covers everything, and the Simba Hybrid Duvet 10.5 Tog is a solid single-duvet alternative if you want heat-regulating tech without the layering system.
Whichever you choose, remember that a duvet is only half the equation - the complete bedroom setup guide walks through the rest, and our cooling blanket vs cooling duvet comparison helps if overheating is your main problem.
For more sleep guides, visit SleepReview
Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. If you have persistent sleep problems, night sweats or a medical condition that affects your sleep, please consult a healthcare professional.
Last reviewed: 2026-08-07