The Celsius R road boot is made with the Pique Gore-Tex® membrane which keeps the feet warm and perfectly insulated during mild winters. Comfort and insulation are further aided by the additional lining on the tip of the foot. Key Features NRG Air carbon reinforced sole (8 stiffness index). Pique Gore-Tex® membrane. Reinforced toe with anti-abrasion technology. SLW2 closure system. Easyfit Climaflex collar with Gore-Tex Rattler® membrane. Arctic 4layer insole. 360° visibility.