INV stakers have the option of using their xINV (staked INV) as collateral in Frontier with the flip of a switch in the user interface. This allows INV stakers to leverage their position by borrowing assets such as DOLA, meaning they can earn additional yield as shown in the DOLA Yield Opportunities section.
Please see the Borrowing page for further details as to how to enable xINV to be used as collateral and borrow against it: