Features: - 5-layer of defense, PM2.5 filtration efficiency up to 96%. - 40mm width ventilating valve, effectively relieve the suffocating feelings. - Adjustable ear hanging to make mask fit face better. - Effective in protecting against dust and air pollution, safeguard your health and life. - Wide application, fit for personal health protection, dust-free workshop, manufacturing industry, service industry like the catering industry and beauty industry, etc.