Strap tightener

thingiverse

Face masks must be pressed tightly against the face to create a tight seal, blocking viruses from sneaking in around the edges and into the nose and mouth. Single-strap face masks can be tricky to get snug enough, even with supposedly adjustable straps that seem to slip and slide. To solve this problem, you can wear a simple device at the back of your head that tightens up the mask's straps. Here's how it works: Place the device on the back of your head, threading the strap through two pegs on each side of the mask first. Then, wrap the strap around and around those pegs in any direction until your mask fits like a glove.