The CrossFit Plug was designed to stimulate the prostate as you walk around with it. The long neck ensures your sphincter enough room to close around it and rest comfortably for as long you keep it in. Its low-profile, flared base fits flush between your cheeks, making this butt plug undetectable under even the thinnest pair of briefs. You need to actually feel this butt plug in your hand to understand the quality of the material!