This TMC Hard Shell Half Face Mask is the high quality polymer material which can protect from the BBs. It is compatible with most kind of goggles both mesh style and shooting glasses. It has three metal mesh construction which makes it more breathable. It has foam construction inside that can be made more comfortable. You can wear it by mask sling or attach to helmet with helmet adapter. The adapter allows you to slot the mask into the rails mounted on the side of the Helmet.
