This is a rubber sealing strip designed to fill the gap between the roof-mounted awning and the vehicle wall. Its main job is to prevent rainwater from leaking into that space, which can help protect the vehicle and improve comfort.

Its specifically made for Fiamma roof awnings:
F80s
F65s
F65L

It attaches directly to the awning casing. No need to remove the awning during installation, making it a quick and convenient upgrade.