LOHOME (TM) 10 Pcs/Pack Multi-purpose Anti-pollution Mask Anti-dust Mouth-muffle Cycling Masks with Inner Activated Carbon Filtration Layer/Easy Breathe-out Exhalation Valve Unisex Protection From Odors Gases and Dust Light and Non bulky, fabric based. Comfort wear, elastic fasteners with latch-on clip. Inner Activated carbon filter layer increases filtration efficiency-dust, pollen, gases, odors. Superior, well-sheathed, flexible metal Nose-bridge Clip - helps to mold mask to nose and face contour. Much-needed Exhalation Valve allows exhaled air to flow out freely - keeps you well oxygenated. Suitable for doing activities like biking, riding, snowboarding, or climbing.