The casing is dust mite proof 100% cotton cambric which is Oeko-tex Standard 100 and carries the Nomite certification. All the feathers and down are washed to ensure that they are clean and then thoroughly rinsed. They are sterilised at 120oC during the drying process. Filling weight 700g. The manufacturer’s instructions say to wash this pillow at 40oC. We have washed it at 60oC and have allowed for the shrinkage in the stated size. Wash 3 to 4 times per year. Tumble dry on a cool setting.