West Biking Half Face Mask , Cycling Mask, Fitness Mask, Workout Mask, Running Mask, Breathing Mask, Resistance Mask, Elevation Mask, Endurance Mask For Fitness Ventilation Holes on Mouth, Soft and comfortable to wear. Material: NEOPRENE Replaceable Activated Carbon Filter WEST BIKING Original Brand of USA Durable neoprene: comfortable to wear, adjustable velcro strap. Dual valve exhaust: expels moisture buildup and easy to breathe.