Graf PEAKSPEED PK7700 Carbon Player Skate - SeniorThe PK7700 CARBON leads the PEAKSPEED Rebels line up. It is one of two first skate models with an inner life based on GRAF's new Two Phase Flexfit Technology. The upper part of the lining is made of Flex Grip Microfiber and in the lower part GRAF used soft and breathable Nylon Velours. For the Asymmetrical Upper Construction GRAF add additional material on the inside of the boot at the very point where a lot of the energy is transferred from your leg