Quest UI hands with outlines

Hi,

(repost: I had this wrongly posted under unity-dev)

I really like the white outline dark hands in the quest system UI. (shown at bottom of this page: developer.oculus.com/design/hands-design-ui/)

I guess it's a shader that makes it possible? Is it available to use, and if not, how can I re-create something similar?

Thanks for any help!