The Extreme R GTX is the winter footwear category leader, the perfect boots for any rider looking for ultimate power transfer. The full carbon fibre sole has a rigidity index of 12.0 to provide the sort of performance boost normally associated with race season shoes. The upper features an advanced construction with patented Northwave X-frame technology for a secure fit with even pressure adjusted by the millimetre via the intuitive step-by-step or full release SLW2 dial. The Easyfit Climaflex collar combines the flexibile protection of the Gore-Tex Rattler membrane with Neoprene to guarantee comfort, an Arctic 4Layer insole ensures superior thermal insulation.