For my Mars medical project, I made a mask similar to a dust mask but you put this on your face when you're about to sleep and you will smell amazing scents that will help you fall asleep fast and keep you asleep for a while. The Mask itself is made of ninjaflex and the little square scent cubes are made of scented PLA. You can pretty much have any scent you want. This mask doesn't come with a string to hold it on your face but the holes for strings are pretty much big enough for anything you can find. It is proven that certain scents help you sleep, with a better night's rest you will have a much less likely chance to get sick. So with this mask is to help an astronaut's night and at the same time lower their chance of getting sick.