1. 100% Polyester: High quality Soft Material, NOT cheap material that easy to pill or tear; Elastic fiber to keep the mask in place and NOT Slide; 2. Exquisite 3D design; 3. Breathable and thin lightweight; Suitable for a variety of sports--Running, Cycling, Biking, Climbing, Fishing, Hunting, Skiing, Snowboarding, Hiking, Camping, Motorcycle, Snowmobile Riding, Mountain Biking, etc. All-Year-Round Using Cool in summer, Warm in winter, Suitbale for you in all seasons. One Size 19.7inch X 9.8inch. (LXW) The thickness size is 0.1 inch Thin. High stretchable circumference is about 21.25-25inch; One Size Fits All Adults