Comfortable to wear: light and very high breathability 3D Ergonomic conception, fits perfectly to your face Soft ear-loops Soft nose-piece without metallic clamp. Soft fabric: perfect for sensitive skin 3 protective layers. Outer layer: Polypropylene spunbonded (non-woven). Filtration layer: Polypropylene melt blown (non-woven). Inner layer: Polypropylene spunbonded (non-woven).