Simpson Venom Darksome Pinlock Lens Clear Pinlock visor for Simpson Venom or Simpson Darksome helmet. A pinlock is an innovative accessory for the visor of motorcycle helmets that prevents condensation and fogged visors. The moisture-absorbing surface of the lens effectively attracts and stores water molecules, while the airtight seal forms a thermal barrier, which together prevents fogging of the visor. - Simpson Venom Darksome Pinlock Lens Clear Size