Hi-Gold Face Mask Inner - Color: Black - Adult Free Size - Brand New, Unused, in Bag. Face mask inner? It's a bit of a confusing term, but it's attached to the inside of an umpire's mask, and then you wear a regular mask over it. This helps prevent the spread of droplets when calling plays. As shown in the fifth photo, the area around the mouth creates a tent-like space, preventing the spread of saliva while avoiding the stuffiness of a regular mask. "Really?" you might think, but it's surprisingly convenient once you try it. It's not uncomfortable, and it's good etiquette when umpires call plays. It's also used by professional baseball umpires. Installation is easy, just attach it with the hooks from the inside of the mask. It can be attached to most standard umpire masks. Originally priced at 3300 yen. Since it's brand new and unused, I cannot offer a discount. I will delete comments requesting a discount.