The Sig Sauer P365 kicked off the micro-compact revolution, packing 10+1 (or higher) capacity into a pistol small enough to disappear inside the waistband. It's one of the most popular concealed carry guns in America — but a pistol that carries this well deserves a holster that keeps up. Here's the best IWB holster for the Sig P365, and the exact size to order.
The Best IWB Holster for the Sig P365: Mainstay™ Clipless IWB
For the P365, we recommend the Mainstay™ Clipless IWB Holster in size 7. The Mainstay's clipless design uses a silicone-coated, non-slip exterior to stay locked in place without a visible belt clip — so there's nothing to print, snag, or give away that you're carrying. It rides comfortably against the body, fully covers the trigger guard, and works for appendix, strong-side, and small-of-back carry.
Running an optic or a light on your P365? Match the size to your setup:
- P365 (bare): size 7
- P365 + red dot optic: size 7-RDO
- P365 + weapon light: size 7L
- P365 + optic and light: size 7L-RDO
The same size 7 fit covers the P365, P365XL, and P365 XMACRO. (The longer-slide P365 Fuse takes size 8.)
Why the Mainstay Works for the P365
Micro-compacts like the P365 are easy to carry but can be tricky to conceal comfortably — a rigid holster on a tiny gun tends to dig in. The Mainstay's soft, flexible body solves that: it moves with you while still holding the pistol securely and keeping the trigger protected. It's made in the USA and priced under $35, which is why it's one of our most popular IWB holsters.
Complete Your P365 Carry Setup
Pair your holster with a reinforced gun belt so the weight rides where it should all day, and browse the rest of our IWB holsters for a backup carry option. New to daily carry? Our everyday carry (EDC) guide covers building a complete loadout.
Frequently Asked Questions
What size Mainstay holster fits the Sig P365?
The Sig P365, P365XL, and P365 XMACRO all fit the Mainstay Clipless IWB Holster in size 7. Add a red dot with size 7-RDO, a light with size 7L, or both with size 7L-RDO.
Does the Mainstay holster fit the P365 with a red dot?
Yes. Order size 7-RDO for a P365 with a red dot optic, or size 7L-RDO if you also run a weapon light.
Is the Sig P365 good for concealed carry?
The P365 is one of the most popular concealed carry pistols available, combining a small footprint with 10+1 or higher capacity. Paired with a comfortable IWB holster, it conceals easily for all-day carry.
Ready to carry? Get the Mainstay Clipless IWB Holster in size 7 for your Sig P365.