Blade-Tech HOLX00033700 Nano Inside the Waistband Sig P229 w/Rail Thermoplastic Black The Nano holster uses thinner material with a single retention screw to minimize the amount of material inside the waistband. Additionally, this thinner material allows for greater concealment and comfort. It offers adjustable IWB ride height and retention, directional pull-the-dot snaps (PDS), staggered belt loops for greater stability, full-length sweat guard, and positive lock trigger guard.