Pinlock insert for the clear visor of the BMW Sport or DoubleR helmet. A Pinlock insert is an antifogging visor accessory. 
This insert is compatible with the following BMW motorcycle helmets: 
Sport Helmet
DoubleR Helmet
How it works
A Pinlock insert is made from a moisture-absorbing plastic that creates an air-tight double-glazing system with the main helmet visor. This layer of air acts as an insulator, preventing the inside of the visor from fogging up. The result is consistently clear vision for the rider.