This is a BLACKHAWK Inside Waistband Holster known as the A.R.C. - Appendix Reversible C, model 417570UG.
BLACKHAWK" A.R.C. (Appendix Reversible Carry) Inside the Pants Holster" Fits S&W M&P" Ambidextrous" Urban Gray Finish
Soft yet durable injection molded polymer material for comfort
Includes two cant and ride height adjustment belt clips for 1.5 to 1.75 belts
Fits Sig P365