Measured in degrees, Cant refers to the angle that a holster is tilted from a vertical position. A straight-drop holster has 0 degree of cant and carries the gun vertically. An FBI-cant holster has a cant of between 10 degrees and 20 degrees. Some holsters are severely canted to 30 degrees or more. More cant aids concealability and it might make the gun more comfortable and/or easier for you to draw. The preference of cant and ride is highly individual. You may find you prefer a different cant and ride for different guns, due to their differing grip angles and shapes.