This combo includes 1 BattlBox Mask and 10 mask filters. These masks offer triple-layered protection and are constructed with the highest quality machine-washable combed cotton. Washable/Reusable The protective particle-resistant outer layer Polyester fiber middle layer for particle filtration Ultra-soft & breathable combed-cotton inner layer Adjustable ear loops for fit and comfort Flexible nose clip for the perfect seal 3D chin design These masks are constructed from the highest quality machine-washable combed cotton, with triple-layered protection. The protective cotton outer layer Polyester fiber middle layer for particle filtration Ultra soft & breathable combed-cotton inner layer These high-quality, replaceable PM2.5 filters are designed for an extra layer of protection and feature 5 layers of particle-blocking activated carbon filtration so you can breathe safely and easily.