The DELSEY innovation: our patented anti-theft zip, the SECURITECH® zip, or ZST®. It's 3 times more break-in resistant than a standard zip and the pull tab is three times stronger than a standard pull tab. That's enough to make you think twice about the zip on your current suitcase and instead choose a DELSEY suitcase with a SECURITECH® ZIP – because what really matters to us is protecting your most valuable belongings!