Using it is simple! You just pop your gun into the clamshell (basically an upside down taco shell) and tuck it up under the front of your bra band. The bra band does all the work -just like normal- and holds the gun in position. The holster does it?s part by covering the trigger to keep it from accidentally being pulled, and by keeping the moisture and oils from your body off the gun as well as keeping the pokey parts of the gun off your skin. As you draw your firearm, the strap on the holster keeps it from coming along with your gun..