Mesh upper Lace closure Synthetic nubuck toe, eyestay and heel overlay Molded sockliner with RS branding Rubber heel piece Back In The ‘80S, The Original Rs (Short For “Running System”) Was Puma’S Innovative Cushioning Technology. Today, The Rs Has Reinvented Itself In The Rs-X, Featuring A Bulky Design And Fresh Material Mixes. This Silhouette Is A Nod Towards The Plains Of Altiplano In South America.