Package include: Only 40pcs carbon filters for reusable. Does not include mask or neck gaiter. The picture just shows how to use the PM2.5 air mask filtering. One Size Fit Most: 15*9.5. Super elastic fabric make our neck gaiter be suited to most head sizes (Men and Women). 5 Layers Filter: 4.9*3.1. Flters can protect you from Dust, Smoke, Pollution, Ash, Pollen and cold weather. Not only for this neck gaiter but also for mask which have insert. Do not wash. This bandana face mask could be neckerchief, headband, wristband, hair-band, balaclava, face scarf, seamless face cover, beanie, bandana and mouth cover as you want. Note: Filter insert can not be washed and recommend be replaced every day. When film or sticky sediment stains emerge.