Torsion Guide System. The distance from heel to the ball of the foot (62% of the shoe) has been designed with extra stability, which ends in the so-called ”ballet” line, a 75° angle. In front of the 75° line, we have equipped the shoe with greater flexibility to stimulate the foot’s natural movements. TGS 62/75 takes all of the gait cycle criteria into consideration. At the same time, it softens the strains caused by friction during lateral movements. The shoe bends in exactly the right places, stimulating the foot’s natural lateral and forward movements.