The following MSA suspension and helmet assemblies are interchangeable and meet ANSI/ISEA Z89.1-2014 when used together. MSA V-Gard Staz-On® and Fas-Trac® III Suspensions are interchangeable among these MSA helmets: † V-Gard Cap (standard size) † V-Gard 500 Non-Vented Cap † V-Gard Hat † SmoothDome Cap † V-Gard 500 Vented …