The K-Formula is the latest flagship kart boot from Sparco which has been developed to provide unequaled levels of comfort. The boots are manufactured from an ultra-light perforated calfskin material upper allows for maximum breath-ability whilst maintaining a soft comfortable fit. Rotary speed lace system for a faster and more precise fitLightweight breathable liner to help reduce perspirationUltra lightweight calfskin leather upper provides superb levels of comfortThin rubber sole for optimum grip and sensitivity on the pedalsThe K-Formula kart boot features Sparco s very latest elasticated rear bellows allowing for optimum ankle flexibility and comfort whilst still feeling secure on the foot. Other top-level features include an ultralight anatomic insole and new rubber sole that offers unsurpassed levels of comfort and grip, and increased levels of sensitivity through the pedals, a brand new rotary lace up system allows for fast and secure closure across the entire boot. The boot al