You use your small size against larger foes.
Benefit(s): As a move action, you can try to slip into the space of an adjacent foe larger than you are. To do so, attempt an Acrobatics check (DC = 15 + 1-1/2 × opponent’s CR). If you succeed, you enter your opponent’s space. If you fail, you remain in your starting position, and you are flat-footed and off-target until the end of your next turn.
While you occupy a foe’s space, that foe is flat-footed and off-target, and it treats its space as difficult terrain. If your opponent tries to move out of your space, it provokes an attack of opportunity from you.
Starfinder Character Operations Manual © 2019, Paizo Inc.; Authors: Alexander Augunas, Kate Baker, Simone Dietzler, Jennifer Dworschack-Kinter, Leo Glass, Sasha Lindley Hall, Amanda Hamon, Vanessa Hoskins, Jenny Jarzabski, Jason Keeley, Lyz Liddell, Luis Loza, Ron Lundeen, Crystal Malarsky, Robert G. McCreary, Conor J. Owens, Joe Pasini, Owen K.C. Stephens, Jason Tondro, and Landon Winkler.