For years we've been told that we should choose a duvet according to tog rating. We've had winter duvets and summer duvets. But what is this rating based on - and is it even relevant to the way we live and sleep anymore?
What is a tog rating?
'Tog' is actually an acronym; it stands for 'Thermal Overall Grade'. For duvets, it's a measure of how much insulation they provide. So, in short, the higher the tog rating, the warmer the duvet.
You'll often see this described as summer weight (3-4.5 tog), spring / autumn weight (7.5-10.5 tog) and super insulating winter weight (12-13.5 tog).
Do I need a different tog rating for winter and summer?
The short answer is that it would be better to look for an all-season duvet.
There are two main reasons why tog rating isn't that helpful in deciding what duvet to use when:
1. Our houses are centrally heated (or even air conditioned). Our winter bedrooms are often warmer than our summer ones, thanks to cranking up the heat. In general, to sleep better you need a cool core, so keep the thermostat at 17-19 degrees and make sure you're not sweltering under a heavy quilt.
2. Some duvets now pack advanced temperature regulating technology. For example, our Simba Hybrid® Duvet fill contains minerals that dissipate heat, and the outer fabric uses Stratos™ technology. That's a phase change material that absorbs, stores and releases heat as you need it to. So the tog rating of the duvet doesn't really reflect that active response to you, and it remains perfect for all year round.
If not tog rating, what should I look for in a new duvet?
There are a few simple things you can do to find your perfect duvet:
- Look for one that'll stop you overheating. You don't want to wake up because you're too warm.
- Check out the fill. Feathers and down are super luxurious, but are a common allergen. A fibre fill might have hidden technology, like ours, which is also completely recycled and vegan-friendly.
- Choose breathable fabrics. A cotton cover is a good idea, especially if you can team it with sheets that allow air flow or have moisture-wicking properties (ours use a TENCEL blend).
In short, think comfort and cooling - and don't sweat the tog rating.