imported post
"Retention strap" , they mean a holster that has a strap that runs around the back of the frame. Could cover the hammer or back of the slide. Several companies offer this for minimal dollars. (Bianchi Accumold , Don Hume , Galco , even Uncle Mikes) Or a Blackhawk style "serpa" holster. This holster incorperates a button on the side of the holster , that doesn't allow removal unless compressed. The holster that comes with your XD (great choice by the way) , is what we call a "twist out" holster , and not atrue retention style.