We are happy with our purchase. we bought the medium washable kingsize duvet. We bought our daughter a wool duvet from a different well known brand, which said it had cotton casing. When it arrived the packaging also said it had a plastic type inner casing, which seemed to miss the point of buying a wool duvet! So I read all the blurb and double checked this product before buying and it has been great, we live in a modern insulated house and its a mild summer. My only niggle is that it is thinner than expected for a medium, but it does actually keep us very warm and feels light and comfy. Will have to wait and see if it does the job in winter though.