If you carry a Sig P365, P365 XL, or P365 X-Macro and you are shopping for a holster, the short answer is that these three pistols are close cousins but not interchangeable in a molded shell. The grip module, slide length, and optic cut differ enough that a shell formed for one will not reliably fit another. Pick the shell that matches your exact model, and the fit, retention, and draw all fall into place.
Here is what actually changes between the three, and how each difference shows up in the holster.
Why frame differences matter less than you think
All three of these pistols share the same core P365 fire control unit, which is the serialized part Sig builds the family around. That shared DNA is why people assume one holster covers all three. For an inside-the-waistband Kydex shell, though, what the holster grips is the slide and trigger guard area, not the grip module. So the grip size on the X-Macro, which is wider and holds more rounds, does not by itself decide holster fit. It matters for comfort and printing, but the shell is molded around the slide.
That said, the frame still affects your carry. A larger grip is the part most likely to print under a shirt, which is where a claw or wing can help rotate the grip into the body. Those attachments are sold separately, so plan for them if concealment of a bigger grip is your priority.
Slide length is the real dividing line
Slide length is where these three separate for holster purposes. The standard P365 has the shortest slide. The P365 XL runs a longer slide and barrel for a longer sight radius. The X-Macro pairs a longer slide with the wider, higher-capacity grip module.
A Kydex shell is formed to the exact slide it wraps. A shell molded for the shorter P365 slide will leave an XL slide protruding or unsupported at the muzzle end, and a shell cut for the XL will not index correctly on the shorter gun. This is why choosing your exact model at checkout matters. The TUKD ORIGIN for Sig is verified to fit the P365, P365 XL, P365 X-Macro, and P320 Compact, but you select the specific model so the shell matches your slide rather than approximating it.
Optic cuts and what the shell has to clear
If you run a red dot, the holster has to clear the optic without dragging on the draw. On the models that carry the optic claim, the TUKD shell is cut for most slide mounted red dots including RMR, Holosun 507 series, and Romeo footprint. That covers the common footprints you will find on an optic-cut P365 XL or X-Macro.
The practical step is to confirm your footprint before you order. RMR, Holosun 507, and Romeo are the families covered. If your optic uses a different footprint, check first rather than assuming clearance. You can dig into footprint differences and what to verify on the optic-ready holster guide if you are not sure what is sitting on your slide.
Matching the shell to your model
For a straightforward decision, line up your pistol with the right resource. If you carry the longer-slide gun, the best holster for the P365 XL page walks through the fit specifics for that slide. If you carry the standard-size gun, the best holster for the Sig P365 page covers that setup. When you are ready to configure, the TUKD ORIGIN for Sig product page is where you select your exact model.
Whichever you choose, the shell is hand-formed Kydex with pre-tuned retention and no adjustment screws. Retention is set and tested before the holster ships, so the draw is consistent out of the box rather than something you dial in.
What comes in the box, and what does not
Every shell ships with a standard belt clip included. Claws, wings, and wedges are sold separately, so if you want to tune concealment for a wider grip like the X-Macro, budget for those add-ons. The design is appendix-first, and a slight clip adjustment lets you move it to strong-side carry if you prefer. Ride height is fixed and not adjustable, which keeps the shell simple and the retention predictable.
The bottom line
The P365, P365 XL, and X-Macro share a family but not a shell. Slide length is the main driver of fit, optic cut is the second thing to confirm, and grip size mostly affects comfort and concealment rather than the shell itself. Choose your exact model, confirm your optic footprint, and add a claw or wing if you want a bigger grip to tuck in tighter.
TUKD shells are made in Las Vegas and backed by a lifetime warranty, so once you have the right model dialed in, the holster is built to stay with that gun for the long haul.