Speedlight 3D Sole. Performance and lightness. The nylon chassis is filled with fibreglass and co-injected to the outer polished TPU shell. The rubber studs provide excellent grip even on the most slippery surfaces. Upper Ultralight PUNW Bio-mechanical Mapping. From a bio-mechanical point of view the foot function is essential as it stores the force generated by muscles which is then transmitted to the pedal in the boost phase. Each element of the BioMap shoes by Northwave has been designed to keep the foot in the correct position while pedalling transmitting the force directly on the pedals without loss of energy. The soles have been reduced in thickness but the overall stiffness has been increased so the mechanical energy transfer action from the shoe to the pedal can be concentrated in a small area. The upper has had its stitching minimized and is designed to anatomically follow the shape of the foot preventing slipping and providing an effective support. The vents have also been strategically placed along the upper and the sole to work as an integrated system designed to provide a constant air flow.2 Asymmetrical Straps. The asymmetrical construction is another innovation of the collection. The bottom strap has been specifically positioned so as to follow the anatomy of the foot and reduce the pressure on the side area; a particularly sensitive spot. The straps have been lightened by all superfluous elements presenting thinner thickness's and discharged central areas thereby maintaining maximum grip. Performance Pro Footbed EVA and microfibre offer lightness sole support and the perfect degree of stiffness to transmit all your power to the pedals. Integrated Heel SYSTEM. The new uni-body construction of the uppers allowed to integrate an efficient heel retention system inside the structure without the need of external elements. Same efficiency reduced weight. Tech: PU Thermo-welded Reinforcement