The washable cotton mask is not a medical device. Indispensable, the fabric mask or general public mask is a barrier accessory used for the prevention by filtration of the projections of droplets from the outside air or sputters and their consequences. He continually reminds us of the barrier gestures: do not bring our hands near the mouth, nose and eyes. It therefore does not protect against the Coronavirus (Covid-19). It helps to respect social distancing.