I bought a double classic summer duvet, as i'm a hot sleeper and normally would wake up sweaty I've noticed straight away that my sleep has improved, i still get hot at times, although no more sweats, and it doesn't happen often, so I'm very pleased with my new duvet, was thinking to get one for autumn/winter as well. The only bad point is, is a bit too big for my double duvet covers, I tried changing duvet covers, but it's all the same on all of them, it could be 1.5-2cm smaller from sides so it would fit it perfectly, as it doesn't look that nice now as the sides are a bit rolled..