Safety and with foresight. When you need to go to the city or be amongst people, it’s not possible without a respirator or nano filter mask due to the current situation. That is why we have had layers of materials with a nanofiber membrane specially made for you, which have the necessary filtration of FFP2 efficiency, the necessary certification and in compliance with the ČSN EN 14683 + AC standard. BUSHMAN nano masks are made by a Czech manufacturer. It's up to you which Bushman print you choose and you also have a choice of two sizes: M and L for women and men (they have the same width, L is an inch taller). They are on rubber bands behind the ears and in addition they have a buckle fastening and the possibility of length adjustment. BUSHMAN nano masks can be washed repeatedly: only gentle hand wash in clean water at a temperature of 30o C. The parameters of the nano mask, including instructions for use and care, also include a link to all certificates and tests, and these can be found in each package. Note: BUSHMAN nano masks fall into the category of Hygiene Needs, and therefore cannot be returned or replaced. Thank you for your understanding. Specification: Outer protective polyester layer Multilayer composite with nanofibre membrane Polyester mesh filtration with efficiency of FFP2 Complies with the ČSN EN 14683 + AC standard Size - M: 18 x 8 cms; size - L: 18 x 9 cms