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It is shown that excitation spectra of Generalized Gibbs Ensembles (GGE) ofone-dimensional integrable models with isotopic symmetry contain universalfeatures insensitive to details of the distribution. Namely, the low energylimit of the subsystem of isotopic (for instance, spin) excitations isdescribed by the effective action of a ferromagnet at thermodynamic equilibriumwith a single temperature and with the stiffness determined by the initialconditions. The condition of universality is that the entropy per excitedparticle is small.

Universal Features of the Excitation Spectrum in Generalized Gibbs Distribution Ensemble