  We review the current status of model building for light dark matter in
theories of QCD-like gauge groups in the hidden sector. The focus is upon the
dark mesons with the $SU(3)_V$ flavor symmetry in scenarios of Strongly
Interacting Massive Particles. We show the production mechanism and the kinetic
equilibrium condition for dark mesons and discuss a unitarization of dark
chiral perturbation theory with vector mesons in the scheme of hidden gauge
symmetry.
