ROA's Katharina Boots for men combine technical functionality with contemporary design. Featuring a Vibram® Megagrip outsole for optimal traction, lightweight abrasion-resistant nylon upper, and reinforced rubber toe box for protection and stability. Lace-up closure for a secure fit. Season: AW25. Composition: UPPER 80% Polyamide 15% Rubber 5% Calf Leather Bos Taurus SOLE 70% Rubber 30% Others Materials.