Pion-nucleon scattering is one of the most fundamental processes in nuclear and hadron physics, which is of particular importance for our understanding of chiral dynamics of quantum chromodynamics. In this talk, I will review recent progresses on the study of pion-nucleon scattering within the framework of covariant baryon chiral perturbation theory with explicit Delta resonances. Chiral results for elastic reactions will be shown and the effect of the inclusion of explicit Delta resonances will be discussed.