Pinlock

Pinlock is a brand name commonly associated with anti-fog inserts used inside motorcycle helmet visors. The system consists of a clear insert that is mounted inside the main visor, creating a second air chamber between the two layers. When correctly installed, this sealed gap helps keep the inner surface of the outer visor free of condensation, improving visibility in cold, humid, or rapidly changing conditions.

The insert is designed to fit the shape and size of specific visors and is typically held in place by edge-mounted pins, clamps, or a gasket mechanism. Proper alignment and a good seal are important for the effect to work; an improper fit can allow fogging to occur. Pinlock inserts are available in different common sizes and for various helmet types, including full-face, modular, and off-road styles. They are often sold as a retrofit accessory for compatible visors.

Care and use guidelines are straightforward: keep the insert clean and free of scratches, use mild soap and water rather than solvents, and replace the insert if it becomes damaged or excessively worn. The Pinlock system is widely adopted in the motorcycle community, and the term is sometimes used generically to describe similar anti-fog inserts from other brands. While effective in many conditions, performance depends on correct installation, visor cleanliness, and matching the insert to the visor.