Duvets with a recycled polyester fill are increasingly common. These are certainly more eco-friendly than duvets made with virgin polyester, but they’re still less desirable than a duvet made with natural materials. Most recycled polyester in duvets comprises re:down or rPET which are produced from post-consumer plastic bottles and other plastic waste. It takes around 120 plastic bottles to produce enough polyester fiber fill for a double or full duvet. This helps to keep plastic waste out of landfill or incinerators and is less energy intensive than producing virgin polyester. However, recycled polyester duvets still produce microplastic pollution, especially when washed and dried. And they require the use of toxic chemicals in production. They’re also less breathable and thermoregulating than natural duvets, which can mean less comfortable sleep. A polyester duvet also promotes sweaty, humid conditions ripe for dust mite breeding.