  We discuss an ensemble of topological solitons -- instanton-dyons and
antidyons - in SU(2) pure gauge theory at finite temperatures above and below
the deconfinement phase transition temperature. The main focus is on the
combined effect of this ensemble on the so called effective holonomy potential,
which drives the confinement/deconfinement phase transition. Using a simple
model with excluded volume and lattice data on caloron density we find that
repulsive part of the potential is robust enough to induce the phase transition
at the right temperature. Model's predictions -- the holonomy potential,
electric and magnetic screening masses as a function of T -- are in qualitative
agreement with the available lattice data. Further predictions are densities of
various dyon types as a function of temperature: while some lattice
measurements of them had been made, much more accurate data are needed to test
these predictions.
