2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/176677We review the recent progress made in understanding instantons at finite temperature (calorons) with non-trivial holonomy, and their monopole constituents as relevant degrees of freedom for the confined phase.4 pag., 2 fig., based on a talk given at ``Quark Confinement and the Hadron Spectrum 7", Ponta Delgada, Sao Miguel, Azores, Portugal, Sept. 2-7, 2006High Energy Physics - PhenomenologyHigh Energy Physics - LatticeHigh Energy Physics - Theorytext