The Pinlock 70 Insert is packed with features... Specifications include Fits The Black? Optimus II SV Helmets - Designed to fit the Black? Optimus II SV helmets with Visors Side Slits - The slit on each Pinlock insert lens is specifically made so that the insert lens is able to fit well on a specific helmet face shield. Silicon Seal - The silicon seal creates a double shield system between the helmet face shield and Pinlock insert lens. Dry Hydrophilic Technology - Moisture is absorbed and contained within the hydrophilic itself, which keeps the surface of the lens dry. PLEASE NOTE - This Pinlock will only fit the Black? Optimus II SV Helmet with the below visor base plate and the Visor fitted