Each Komatsu mask features 2 layers of cotton and for an extra comfortable fit two black elastic over ear straps are adjustable in length using a simple slide mechanism. A squeeze tight, secure nose clip provides better protection against the possible transfer of airborne particles. The mask features an internal pocket to allow the wearer to insert an extra layer of protection and includes a carbon filter, suitable for 72 hours of use before its recommended to be replaced. It will filter particles as small as 2.5 microns in size. Each filter is stamped with the mark PM2.5 which stands for Particulate Matter 2.5 microns. The mask is a non-medical device but will protect against solid particles and droplets. Hand washing in a mild detergent is recommended after each use, rinse well and dry before using again.