Two-layer 100% premium cotton with the right thickness plus one layer non-woven cloth providse good filtration and ease of breathing. Soft and comfortable | Adjustable earloops and nose wire to achieve the best fit and security | 3D structure to hold your chin and keep the covering from shifting up and down | PM2.5 filter holder ready so that you can insert filter to increase safety | Ship from the USA, arrives in 2-5 days, faster than the estimated time