The inner boot of the Vector 115 is fully customizable thanks to HEAD’s Perfect Fit where the liner and tongue are made from a mixture of high and low density thermoformable material that molds to the foot and the shell when heated. The Vector 115 has a mid- to high-volume 101 mm last and a flex index that can vary from 105 to 115. Double Power levers offer more leverage for the Double Power Spine Tech micro adjustable buckles.