COFRA FACE MASK AIR FREE FFP3 WITH VALVE. The mask is light and comfortable. It is equipped with a small hygiene bag that allows use when necessary. The special shape of lower resistance to breathing. All-hard the inner end is made of double layer velvet/sponge. They do not exist exposed metal parts- the exterior muzzle used to adjust it mask on the face is coated with metal Lo. The elastic bands are adjustable in 4 positions mine. The structure and materials are long lasting and avoid collapse in wet environments.