Saucony - Kalenjin Flat (Silver/Black) - Men's: A lightweight racing flat built with minimal materials for cross country competitions where spikes are not permitted. Compression molded EVA midsole provides comfort and cushioning. Non-Visible HRC (High Rebound Compound) in the heel. HRC is a responsive EVA/rubber compound which provides cushioning through the later stages of the gait cycle. Rubber lugs for traction. XT-600 Carbon Rubber outsole offers outstanding abrasion and traction properties. Shoe weighs 6.7 oz.