I have now bought three wool duvets, a medium double for the spare room and a light and a medium king size for us. We really like them - they are warm and comfortable, suit both my husband (who likes a warmer duvet) and me (preferring a cooler one) and it is nice to know that they will remain bug free! My son has also bought one, after using one at our house, and is very pleased with it. He lives in Colorado, and it copes well with the varied temperature. Originally, I was hoping that my night sweats would be helped by the wool duvet, and they have improved a little, but it has not completely solved the problem.