We previously had a goose down and feather duvet and a memory foam mattress topper. Decided to try wool replacements as I am suffering from hot flushes/night sweats. Also bought 100% cotton nightwear (elsewhere). I find that the wool topper stays nicely in place, whereas the memory foam one was thick and moved around. It is comfy and cosy although not as thick as I am used to. The duvet is the Medium Weight Autumn/Spring one (mid-range) and I like it very much, it is thinner and more dense than down/feather and does hug you nicely. I'm not sure whether it will be warm enough for the really cold nights but should be OK with blankets on top. Would be too warm for hot summer nights (not that it is intended for those). Note that there was no noticeable smell to either product, certainly nothing unpleasant. As to the hot flushes, I am still waking up feeling hot, but not as sticky or sweaty and I think the feeling passes quicker, so would recommend. Note that lots of alternative wool duvet products incorporate an artificial layer, which would seem to defeat the object for this purpose. Quality products well presented in cotton zip up bags.