Design description] full screen printing, single side printing [material description] 100% polyester (polyester), 5-layer protective activated carbon filter, M-shaped nose clip [product performance] it is very soft, breathable, water proof and washable. With buttons, the tightness can be adjusted. The length can be changed according to the contour of your face to avoid leaving traces on the face after taking off. Protect your mouth and face from dust, cold, dust, pollen, allergies, fog and haze, exhaust emissions, passive smoking, etc [applicable scenario] suitable for cycling, camping, running, traveling, climbing and daily use. (non medical mask) [accessory structure] one is equipped with 2 filters, 5 with 10 filters and 10 with 20 filters [washing instructions] hand washing is recommended. Do not bleach. [special note] due to different measurement methods, the error of this size data within 1-2cm is normal. [applicable scenario] it is suitable for cycling, camping, running, traveling, climbing and daily use. Protect you from fog, haze, vehicle exhaust, passive smoking, etc. (non medical mask) [accessory structure] size (excluding elastic belt): 20 * 15cm [washing instructions] the machine is hand washing, quick drying, easy to care and durable. Do not use bleach. [special note] due to different measurement methods, the error of this size data within 1-2cm is normal.