A sole core formed in the shape of a strip is disposed longitudinally along a central portion of the sole and functions as an axis of rotation with torsional flexibility. More specifically, in one embodiment of the present invention, a sole for a snowboard boot includes a middle sole core member ...http://www.google.co.uk/patents/US5850702?utm_source=gb-gplus-sharePatent US5850702 - Snowboard boot sole
