Reusable Safety Opening System - In an emergency the QuickBurst® zipper is a reusable solution, which will open quickly and easily. The special opening system was specially designed for technical applications. Other than 5VS, we have 3VS for lightweight garments and 8VS for heavy-duty applications. Also available in Vislon® Flat, a flat element version, (5VZ). 5VZ meets EN ISO 12402-7 as a life jacket inflation system component.