RÃªverie Nature duvet. The eco-friendly duvet! RecycâFill filling, siliconised polyester obtained mainly from recycled bottles treated with GreenfirstÂ® dust mite protection. 100% organic cotton cover.Â Perfect all year round: a 175g/mÂ² duvet for the summer, and a 300g/mÂ² duvet for in-between seasons. Join the two together to form the winter duvet. Fastened with ties. RecycâFill filling made from siliconised hollowfibre, allowing better circulation of air and reducing build-up of moisture. 100% polyester. 100% organic cotton cover (certified by the Control Union Label).Â Hexagonal stitching, strengthened with double stitching. Cotton taped edging. Machine washable at 40Â°C. Treated with active biocide.