Description: Tcare dust masks are suitable for various outdoor activities where dust may be present. For example: mountain bike, running, horseback riding, snowboarding, Moto-X, ski speed, walking, climbing, bicycle, walking, motorcycle, etc. Also suitable for: exhaust gas, viral flu, industrial exhaust gas, dust allergy, PM2.5. For best performance, the mask must be properly sealed around the nose and mouth so that all inhaled air can pass through the filter. Package Included:50/30/20/10Pcs x ice silk dust mask Style: Adult mask (30x13cm) Children 4-12 years old mask (23.5x9.4cm) Feature: 1. 100% brand new and high quality. 2. Made of high-quality sponge material, breathable and comfortable. 3. It can be washed and used repeatedly. 4. Foldable, you can put it in your pocket and then carry it with you. 5. The elastic and widened earband design makes it easy to wear, strong and comfortable. 6. The upgraded version of the breathing valve reduces heat and humidity, making it more comfortable to wear. 7.Free Size: Men's and women's clothing 8. Function: dustproof/prevent pollen allergy, etc.