The best ankle holster out there - Alien Gear Holsters ShapeShift Ankle Carry Expansion Pack

I love mine, been carrying it for about 6 months now. I use it for my backup P365 duty holster. It's comfortable, stays in place all day no matter what I do (I'm pretty active). I have also tested it while running, and it stays secure. You can adjust it higher or lower to get it right in that sweet spot depending on what kind of boots you're wearing, and best of all, it has an adjustable retention lock so you can feel like your gun is extremely secure, or you can loosen it a little if you want an easier draw. I also absolutely love the piece that goes down into your shoe. It's padded and comfortable, and it keeps the gun from riding down your leg, which is the worst issue with ankle holsters. I don't know how they could have done any better.

I know there is one other review on here complaining about the strap being too tight around the leg, and all I can say is that guy must have gigantic legs. I have big calf muscles myself, and I have plenty of room to loosen it up if I wanted. The strap is elastic, and I can imagine it fitting just about anyone that isn't extremely morbidly obese (not an insult btw). That being said, you want your ankle holster to be pretty tight. Also, they have a lifetime warranty if anything like the velcro hooks or retention device wear out they'll replace your holster. Anyway, if you're in the market for an ankle holster for the 365, don't hesitate. This is the best.