This will be done to match your mask impression. The masks have thread to the nose that can be molded to fit the shape of your face for a safer fit. They have 2 slots on the back where a filter can be inserted between the two if desired.These masks are not medically approved and offer no physical barriers. I don't make any medical or health claims. Wash them regularly and use it with good hygiene behaviour. Wash by hand or machine at 40 c. Do not wear during moisture. Printing placements vary in each mask. I'd like to see all the photos of you with my marks, so don't be afraid to score and do my #standgwyn day.