1. Breathable, High Quality Material.
2. Filters can be replaced, protects you from dust and cold wind.
3. Double air valve design, help you breath easier and freely when riding the bike.
4. Can adjust the mask freely with velcro strap according to you own demands.
5. Neoprene fabric. Touch gentlely, efficient to keep warm.
6. Adjustable Velcro design, makes you more comfortable when cycling or running.
External Material: Neoprene, flexible, elastic, dust and hot
Internal Material: nonwoven fabric, polyester wadding, charcoal, flannel, velcro fastening
Size: About 30cm x 16cm/11.81 x 6.3 inch
One size fits for most people