I tend to take a lot of the marketing claims made by companies with a huge pinch of salt, but the cloud duvet is ridiculously warm and cozy in the colder months, whilst simultaneously being suited to the summer months.  Yes, it's more expensive than some brands (cheaper than a lot out there) but I would 100% recommend this to anyone looking for a good quality duvet that's useable all year round. Bought a second one for the spare bedroom.