Sig Sauer P365-FUSE Holster Our Sig Sauer P365-FUSE holster was designed and crafted using our high-tech proprietary process to exacting specifications. We’re so confident in our holsters that we back them up with a lifetime warranty and 30-day free returns. The Base Sig Sauer P365-FUSE IWB holster is designed for EDC and all-day comfort. It can be worn cross-draw, appendix, strong side, or all the way to small of the back. It fully protects the trigger and mag release for ultimate safety. If you have a Sig Sauer P365-FUSE with optics or red dot, we have you covered with our optics ready cut . The optics cut is compatible with or without optics, so if you plan to add one later, getting the optics cut now is a good idea.