These zips are ones that open fully so that the two sides of the zip separate from each other.
For example, these may be used on a jacket or cardigan so you can open it all the way. These come in different styles for example Plastic Open End, Nylon Open End and Metal Open End. Different styles of open-end zip can be used on your garment depending on how heavy your fabric is. If you require further assistance, please get in touch.