Powerblade GTR110

Rollerblade has teamed up, to develop Gravitational Torque (GT) Technology. GT displaces pressure through the middle of the skate, enhances the center of gravity and positions the body for maximum torque resulting in substantial benefits such as improved power transfer, response, speed and efficiency.
The frame and wheels are mounted to the central fixation point on the boot, which drives the power directly to the middle of the skate. This is beneficial to the skating experience because gravitational torque optimizes efficiency for all types of strides at top speed, constant speed and cornering or carving.

Via - The Awesomer