Through this boot adjustment system the TCX® Centre for Research and Development has found the perfect solution for granting every rider excellent comfort as the system is able to adapt to any foot shape. The system comprises an air chamber made from antibacterial, antiallergenic polyurethane that allows you to vary the volume through a pump inserted in the top part of the boot. The air chamber is divided into areas of differing thicknesses, designed to follow the shape of the instep and shank in the best possible way once inflated. Therefore, using this pump it is possible to gradually inflate the air chamber, adjusting pressure on the foot and therefore optimising the fit. Finally, a brass and steel air valve allows fine adjustment and full deflation of the air chamber to make it easier to pull the boot off when you have finished using it.