A cab of a mobile machine may include a seat for an operator. The cab may also include a first vertical plane centrally located on the seat and extending along a length of the cab. The cab may further include a rollover protective structure (ROPS). The ROPS may include a first component and a second component positioned on either side of the first vertical plane. At least one of the first component and the second component may include a single tube shaped to form a C-post positioned behind the seat, a B-post positioned in front of the seat, and a header connecting the C-post and the B-post. The C-post and the B-post may each include support structures that extend from a floor of the cab to a roof of the cab. The header may extend along a length of the cab.