shoes northwave extreme tech plus represent the maximum advance in mark northwave road shoes. it is a model developed to deliver the best performance with a weight of only 235 gr. the extreme tech plus is the best combination of performance, design, aesthetics, technology and performance. all components of the extreme tech plus have been designed to offer maximum lightness. in the development of the shoe is has taken into account all the advances in biomechanics (biomap), so the design of the shoe is the most efficient. this translates into a perfect synergy between body and shoe for the activity. the ultralight rigid carbon fiber sole is designed to transmit power of pedaling efficiently, minimizing the loss of strength. the micrometric closure slw2 (speed lace winch) represents the evolution of the slw closing system and has been redesigned in size and weight. it offers maximum precision and ease of use. the slw2 allows you to tighten and loosen laces easily and intuitively before and during the race, just with a twist. the side button has a dual function: pressing it allows micrometric adjustment and lifting it allows a total and immediate opening. extreme air ventilation system ensures that the foot well ventilated, so light, anti-allergic and anti-bacterial. features:-slipper of competition. -ultralight shoe: 235 gr. – designed to offer maximum lightness. -closing slw2. -sole of carbon fiber to transmit the power of pedaling efficiently. -extreme air ventilation system. -lightweight microfiber construction. -recommended use with speedplay cleats.