SparcoMercury KB-3Light weight leather boots, closure strap, new sole, breathing mesh. COMPOSITION: Leather upper and ultralight perforated Polyester mesh. Ultraslim heavy duty Velcro. Anatomic inner sole with plant support (PS). K01 ultraslim sole, antislip, antistatic, oil resistant. CHARACTERISTICS: Super light, maximum breathability. Perfect fitting thanks to anatomic closure. New K01 ultraslim sole with high-grip areas.