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. Made with a waterproof and windproof Gore-Tex membrane guaranteed to keep you protected from the elements. Northwave has a working partnership with Gore fabrics which goes back 15 years. The consolidated experience of the Gore-Tex technicians and Northwave Lab designers are reflected in the products they create together, with a creative synergy that capitalises on constant technological advancement. 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. Key Features: Morph Carbon AAS sole (12 stiffness index) XFrame upper completely alleviates pressure points SLW2 closure system Easyfit Climaflex collar with Gore-Tex Rattler membrane Arctic 4layer insole 360 ° visibility