No smell & No overflowing: The filling material is a mixture of 50% grey feather and 50% 7D cotton to ensure comfort and support. The material of feathers have been washed 33 times and sterilized at high temperature, so don't have any smell. The cover of pillow inserts is made of 100% cotton in order to prevent down overflowing. Fluffy and Supportive: Our pillow inserts provide comfortable and relaxed enjoyment for you. 500g/1.10lb (15% more filling than others) Feather down and 7D virgin microfiber filled mixture solved the problem of insufficient fluffy of polyester pillow inserts and insufficient support of feather pillow inserts.The blend of them increases the fluffy by 30% and the support by 40%. Versatility: Suitable for sofa, bed, couch, living room, bedroom, office, etc.