Mission Inhaler FZ-0 Roller Hockey Skates features a(n) off-white Curv® composite quarter package that's lightweight as well as durable. Additionally, the quarter package features a vent system on both sides of the boot which help with airflow & breathability during practice, gameplay, or your general skating session. The interior features a thermoformable Grip-Fit PRO liner with CT technology to help keep your feet in place. Liner is heat moldable for an anatomical fit. PORON XRD ankle padding provides players with additional layer of protection & enhancement to their level of comfort. The boot sits on a carbon composite outsole that pairs with the HI-LO Kryptonium chassis. (2) 76mm Labeda Addiction wheels (front), and (2) two 80mm Addiction wheels in the back. This particular wheel configuration helps you have greater control over your stride as well as balance.