I Googgled "streamlight trl6 shield holster" and looked only at the images results, and found mostly Kydex. And this:
71YXzMO6CIL._AC_UL320_SR256,320_.jpg
Just: though I was gratified to see plenty of efforts amongst the "kydexians" to deal with the issue, be aware that when a rigid holster is made for the bulging lights, a striker fired pistol can be vulnerable to items tangling inside the trigger
when it's already holstered; because an opening has been left behind for the entry of the light (and there is no safety).
I write often about these things on the defensive carry side of the forums here, and ultimately we all get tangled up in semantics. So, simply be aware :-).