Features: A specially developed mask to give country and sports cyclists with excellent protection against particulate pollution.,Uses a HepA-type filter to protect against sub-micron particulates such as pollens and respirable dusts.,Includes two free flowing Powa valves to allow unimpeded exhalation, which is particularly important when riding at your limit.,Comes in two sizes, with a contoured shape for a snug and comfortable fit, and Velcro pads for easy application.,Made from aerated Neotex giving a lightweight and well vented mask.,The filter is replaceable, and is designed to remain effective until a noticeable discolouration of the filter occurs.,.