Casque moto avec Pinlock : Pourquoi et comment Casque double écrans pinlock ready MT Helmets Thunder 4 SV Mil C2... Pinlock Hjc Rpha 11 Pinlock MT Helmets Pour Casque Thunder 4 MT-V-28 Max Vision 70 Antihao Pinlock Hjc Is17 It's called a Pinlock insert. This clever lens attaches to the inside of helmet visors equipped with Pinlock posts (which is most of them) and creates an airgap to help mitigate fogging. Just like popping open your visor, but without the wind blowing in your face. We use Pinlock inserts regularly here at MO with great success