One of Luna’s many gifts to her children are moon paths through the mists of the Umbra. A moon path appears in the Penumbra as a shaft of moonlight. A werewolf who touches the light can find herself travelling on a moonbeam with the mists of the spirit world swirling all around her. So, the Garou can travel through the Umbra and even in other realms inside the Umbra.
Moon paths are the easiest to travel during the full moon.