Sparco karting shoes Gamma KB-4 Black. The 3D synthetic microfibre fabric is highly wear resistant and breathable. The area around the shoe collar has been reinforced with padding and a perforated mesh. The inserts are in suede. The boots are equipped with a breathable inner lining and anatomical insoles with an impact absorption area at the heel. The soles on Gamma KB-4 boots are asymmetrical and are designed to reinforce the outer sides of the toes and the inner rear area, which are used as pivot zones when driving.