1) Grow out stubble and then wash your face to help define the line for your chin strap beard. 2) Use a trimmer to shorten excess hair and establish clear edges, then use gel to identify hair growth and edges. 3) Visualize the look and shave off excess hair along the desired edge to create a clean chin strap that is typically even in width from the sideburns to the chin and does not exceed 2-3 cm wide.