Silk Duvets, which are filled with layers of spun silk instead of feathers or foam, are much cooler than non-silk equivalent tog(weight) duvets, so you get the

Silk Duvets, which are filled with layers of spun silk instead of feathers or foam, are much cooler than non-silk equivalent tog(weight) duvets, so you get the comforting weight of a thick duvet but without all the heat. We've had Mulberry Silk duvets for many years and I can totally recommend them.