Fog forms when moist warm air touches a cooler surface. When your warm breath inside a helmet touches the cooler surface of the helmet’s face shield, the result is fog on the inside of the face shield.
An Anti Fog Insert is an elongated oval sheet of polycarbonate with a rubber edge. When installed on the inside of a helmet’s face shield, it traps a layer of air against the inside of the shield.
This trapped air acts as insulation and prevents your warm breath from contacting the cooler surface of the helmet shield, with the purpose of preventing fog from forming.
The Anti Fog Insert can only be installed onto a shield one time. It will not adhere to a different shield once removed from where it was initially installed. An installation template is included to aid in placing the insert onto your helmet shield correctly.
The Anti Fog Insert provides an added level of fog control and is effective in high humidity, high temperature racing conditions.
Bell Sport uses 281
Bell Sport EV uses 288