Made of Abs Material, Durable to Use. In hot and humid working environment with poor ventilation or heavy labor, the use of mask with breathing valves can help you feel more comfortable when exhaling. Suitable for running, cycling, hiking, skiing, motorcycle climbing, rock climbing tactical training and other activities.
Outer Size: 40mm x 35mm/1.57" x 1.38"
Inner Diameter: 18mm/0.71"
Available in Black, White, Clear, Red, Blue and Yellow