Gum Rubber Revival; Reebok Classic Leather SG Men's Retro Running Shoes in Sand Stone. Classic style reigns supreme this season. Reebok created its men's Seasonal Gum Pack to dish out throwback looks with up-to-date styling. Soft nubuck leather smoothes out the look while the OG gum sole keeps the silhouette authentic. Designed for: Classic looks, on-trend style, casual wear. Low-cut design for a sleek and sophisticated silhouette. EVA foam midsole cushions each step. Gum rubber outsole for traction with heritage appeal. Clean, seasonal colors ride well over the gum sole. Materials: Pigskin nubuck upper with a leather heel accent for support. Color: Sand Stone / Chalk / Gum.