ATV Tek Pro Series Rider Dust Mask - The ATV TEK Pro Series Rider Dust Mask air cleaning filter blocks up to 99.9 percent of dust particulates for more enjoyable riding on dry, dusty trails. The one-way Tek exhaust valves regulate heat, CO2, and water vapor. A breathable, moisture-wicking four-way stretch mask specially designed to be worn with all open and closed faced helmets and goggles for all-day comfort. Universal size fits most. Patent pending. Filter blocks up to 99.9 percent of dust particulatesTwo Tek one-way exhaust valves regulates heat, CO2, and water vaporBreathable, moisture wicking maskWashableReusable