  The Son Of X-Shooter (SOXS) is a single object spectrograph, built by an
international consortium for the 3.58-m ESO New Technology Telescope at the La
Silla Observatory, ranging from 350 to 2000 nm. In this paper, we present the
progress in the AIT phase of the Near InfraRed (NIR) arm. We describe the
different AIT phases of the cryo, vacuum, opto-mechanics and detector
subsystems, that finally converged at the INAF-OAB premises in Merate (Italy),
where the NIR spectrograph is currently being assembled and tested, before the
final assembly on SOXS.
