The Sparco Gamma KB-4 kart boots are highly resistant and breathable thanks to the use of microfiber fabric. They feature 3D synthetic microfiber fabric that is highly wear resistant and breathable. Anatomical insoles are also utilized with impact absorption area at the heel. The soles on Sparco 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.