An adult, usually a parent, serves as a Webelos Den Leader in a Cub Scout Pack (a Webelos den is usually made up of 6 to 8 Cub Scouts in 4th or 5th Grades). Webelos Den Leaders carry out the activities related to adventures as they are presented in the Webelos Scout’s handbook and the Webelos Den Leader Guide. Worn on the left sleeve under pack numerals.