To prevent infection, please use a high safety mask. If you are looking for a more secure infection control, this is the perfect mask! Protect your life, work and performance from infections. It is especially recommended for medical sites where contact with infections. N99 mask capture efficiency is 99%. The N99 mask has a higher level of protection and sealing performance against infectious pathogens compared to N95 masks with less filtration efficiency. Masks are evaluated for catching efficiency and adherence to the face. The low fitting mask does not stick to the face and allows air to enter and breathe through the gaps. Masks that do not fit snugly on the face are difficult to prevent viruses from entering.