How to choose between a duvet and a blanket
Short answer: A duvet insulates with air trapped in the filling and can hold a steady temperature all night. A blanket has less air inside and ends up either too cold or too heavy.
The air insulates, not the filling
The duvet's filling holds still air in place, and it is the air, not the filling itself, that warms you. A blanket has markedly less of that air, no matter how thick the fabric itself feels, which is why the two types behave so differently. See bamboo bedding.
Weight is not the same as warmth
A heavy blanket feels warm to lie under, but it does not necessarily insulate better for it. The weight itself can feel pleasantly grounding, but that is a completely different feeling from real insulation, and the two should not be confused when choosing.
For people who sleep warm
A light duvet or a thin blanket combined with a sheet that releases moisture quickly is often the right choice. See home and homewear in bamboo for textiles that do not hold onto heat unnecessarily at night.
Separate duvets solve it best
If two people sleeping in the same bed run at different temperatures, two separate duvets solve the problem better than any other single change. See bamboo sleepwear for women for the same principle applied to sleepwear.
The cover matters too
A tightly woven cover limits the duvet's ability to release moisture into the air outside. Choose a cover that breathes, or it cancels out some of the duvet's good qualities. See washing and care.
The type of filling matters
Down and feathers generally hold air better than synthetic filling of the same thickness, but synthetic filling more often tolerates machine washing without issues. Choose based on what you can actually maintain.
Switching by season can pay off
A summer duvet with less filling and a winter one with more is a simple change that solves the problem year round without compromising on either one.
The blanket has its advantages
A blanket is easier to wash and air than a duvet, and it works well as an extra layer over a light duvet during the coldest weeks, without making the bed too warm the rest of the year.
Try before you choose
If you are sweating under a duvet that should be right, the problem is often the cover or sheet rather than the duvet itself. Swap one element at a time to find the cause.
Frequently asked questions
Is a duvet warmer than a blanket?
Usually yes, because the filling holds still air that insulates better than a thinner layer of fabric of the same thickness.
Is a heavy blanket warmer?
Not necessarily. Weight feels pleasant, but it does not necessarily insulate better on its own, and the two should not be confused.
What helps when two people sleep at different temperatures?
Two separate duvets. That solves the problem better than any other single change, no matter how good the cover otherwise is.
See our range of men's bamboo socks.
