Seamless fit improves the protective function of the mask. The mask is strong and durable. Suitable for respiratory protection, filtering dust, haze, bacteria, droplets and other harmful particles in the air. MULTI LAYER PROTECTION. The outer layer blocks large particles. Melt blown cloth layer blocks more than 94% particle attachments. Structural Layer builds a 3D space for non-contacts between your mouth and the respirator. The inner layer with soft materials contacts your face for comfortable user experience.