Specifications A winter duvet from the Boomba Bamboo collection is delivered free of charge within two working days, so you won't be faced with unexpected costs. The winter duvet comes in a handy storage bag made of 100% natural bamboo, when it's time to change your winter duvet for a summer duvet you can easily store your winter comforter. For sending the order, we want to think about the environment as much as possible, for this we only use shipping bags that are biodegradable.Collection Boomba bamboo.WarmEnjoy a good and natural sleep in our signature line of natural bamboo bedding. Our bamboo duvets are warm, silky soft, breathable and free of harmful chemicals and pesticides, as demonstrated by the OEKO-TEX®.