Webelos dens are for children who have completed third grade (or reached age 10). Webelos Scouts get to work on the five required Webelos adventures and choose two of the 18 elective adventures that are shared by the Webelos and Arrow of Light ranks.
When a child has done the requirements for an adventure, the Webelos den leader, rather than a parent, approves most of the adventures. For each adventure a child completes, they receive a pin to wear on the Webelos colors or on their hat. After completing seven adventures, including five required adventures and two elective adventures, a Scout can receive the Webelos badge.
After they have earned the Webelos badge, a Webelos Scout can work on the remaining 18 shared Webelos and Arrow of Light electives until they finish fourth grade (or turns 11 years old). They can choose elective adventures that may show them new hobbies and teach them skills that will be useful during their Boy Scout years. When they complete an elective adventure, they receive an additional adventure loop to wear on their belt.