Filling: 100% polyester hollow fiber. Cover: 100% polyester. Duvet with Sanitized® hygiene function for lasting protection against microbes and bacteria. Recommended for allergy sufferers, dermatologically tested. Longer service life thanks to antimicrobial active ingredients. Odor-repellent. Breathable. The silicone-coated fiber protects the duvet from clumping. When chlorine is used, this silicone dissolves and the fibers in the duvet clump together.