The Zebras with pocket clips that are snap-on, are really quite tight. I don’t know how they’d come off accidentally.
I don’t like the lanyard ring, so I removed it. If I need a lanyard, I clip it to the base of the pocket clip. I normally don’t use the pocket clip unless I plan to not use the light for awhile, but it’s definitely useful. My only wish is that they’d go back to the design where it would rest on a smooth part of the tube, for less pocket-shredding.