What feature does a collapsible brush provide?

A collapsible brush is specifically designed to fold up, making it ideal for convenient storage and portability. This feature allows it to fit easily into bags or drawers, which is particularly beneficial for individuals who travel often or have limited space for their grooming tools. When evaluating the other options, the sturdy bristles may enhance functionality but are not necessarily connected to the collapsible feature. Likewise, while some brushes are indeed better suited for wet hair or feature wide tooth designs, these characteristics do not pertain to the collapsible aspect of the brush. Thus, the practical benefits of portability and easy storage distinguish the collapsible brush as a useful grooming tool.