Silk filled duvets are a luxury that has been appreciated by the higher echelons of Chinese and Japanese society for generations. Today in many Asian countries silk filled duvets are preferred for their comfort. Because silk is natural and 'breathable' it creates a unique sleeping environment. Silk is much more tolerant of changes in the ambient temperature of the bedroom which means that while it is warm when required you are much less likely to overheat under a suitably chosen weight of silk filled duvet - the 'warm in winter, cool in summer' effect for which it is renowned.