There are plenty of masks available now for regular, everyday use but none have been ideal for sport. Under Armour has built their three-layer UA SPORTMASK for running or training with a structured design that sits away from the face and lips for comfort and breathability. The outer shell of the mask uses a water-resistant fabric while the inner layer has an anti-microbial treatment to help keep the mask clean. It also features polyurethane open-cell foam for breathability, an adjustable nose piece, stretchy ear loops and side panels, and a washable, anti-microbial carrying case. 

$30, underarmour.com