?? CLASSIC SIZE: Unilateral hanging ear strap 9cm / 3.5, mask part: 20x14cm (7.9×5.5). One size fits most. Our mouth masks is big enough for you daily use. ?? NO DISCOMFORT: This mouth mask adopts high quality Nylon stretch fabric, making it soft and comfortable to your face, very effortless breathable to wear,and it won’t induce discomfort. ?? ADJUSTABLE: The ear loop of our face mask is adjustable, you could freely change its length according to your face contour, preventing leaving trace on your face after taking off. ?? ANTI-DUST: Wearing this face mouth mask, you could be protected from dust, small particles on air, pollen and much more.Anti-dust,anti-odor; washable and reusable. ?? APPLICATION: This anti-dust mask is ideal for both women and men, suitable for cycling, camping, running,travel,climbing and daily use. Protect you from fog, haze, vehicle exhaust, passive smoking, UV etc.