  What is the upper limit of the mass of the neutralino dark matter whose
thermal relic is consistent with the observation? If the neutralino dark matter
and colored sparticles are extremely degenerated in mass, with a mass
difference less than the QCD scale, the dark matter annihilation is
significantly increased and enjoys the "second freeze-out" after the QCD phase
transition. In this case, the neutralino dark matter with a mass much greater
than 100 TeV can realize the correct dark matter abundance. We study the dark
matter abundance and its detection in the case of such highly degenerated mass
spectrum of the neutralino dark matter and colored supersymmetric particles.
