Thanks to the fibre-reinforced NRG Air Carbon sole with a stiffness index of 8.0, very good power transfer is possible, while the upper shoe with its overlap construction stands for reduced wind resistance by binding the foot evenly and without pressure points, helping to transfer every watt of power with pinpoint accuracy. The reinforced and abrasion-resistant toe area in combination with the SLW2 twist closure system, which is the only one of its kind with its micro-step grid for millimetre-precise adjustment and adaptation of the shoe.The Easyfit Climaflex collar in the entry area combines the extreme elasticity of the Gore-Tex Rattler membrane with the high thermal insulation of neoprene, thus increasing mobility and protection. The ergonomic heel shape with its anatomical fit thanks to the latest thermoforming technology in conjunction with our Arctic 4Layer insole made of EVA + aluminium and EVA + pile ensures excellent thermal insulation. The 360° reflective inserts ensure greater safety in poor visibility conditions.