Can be combined with any TUNIT chassis or stud system to create a customized boot. UPPER: Calf leather for excellent ball feeling and glove-like fit. 2nd density, clear, 3-D heel/bottom unit for optimal combination of stability and flexibility - not to mention a unique look! Velcro® lace cover for increased kicking area. Agion antimicrobial lining to stop odor, bacterial and fungal growth. WEIGHT: (5.8 oz) Imported.