The Pump�: By eliminating the amount of air in the internal chamber, the Pump eliminates natural gaps around the ankle giving you a customized fit while preventing heel lift Wheels: Labeda Addiction wheels are the first of their kind offering outdoor wheel hardness with an indoor wheel grip. Faster, amazing wear and grip built into one high performance wheel that has no equal Chassis: Lightweight stiff, powered by Labeda, with a 4x80MM wheel configuration to put you in the fastest skating position Pro Armour� IV: Strategic integration of a lightweight core and durable outer shell combine to make embedded composite technology