The Kinvara 4 is a perfect synthesis of celebrated design elements form previous versions. The redesigned upper continues to utilise FlexFilm for a lightweight, seamless feel. Those who love the Kinvara will appreciate the upgrade from ProGrid to PowerGrid in the heel landing zone for even smoother transitions and an improved overall ride.A minimalist approach to shoe design has brought about this excellent running shoe; lightweight and responsive, it aids the foot in moving through the gait cycle as smoothly as possible while offering an incredible fit.After studying patterns on thousands of test shoes, the Kinvara 4 now features XT-900 rubber strategically added to parts of the outsole for better durability; the outsole has also been bevelled to achieve even smoother transition. There is Flexfilm technology in the upper to secure the foot on the platform throughout the gait cycle and a 4mm heel-to-toe offset encourages a more balanced running form.One reason for this impressive fit is the strategically placed memory foam in the heel which provides a heel pocket, thus contributing to the comfort. In addition to this, the shoe's Hydrator lining provides next-to-skin comfort while wicking away moisture.The midsole consists of high abrasion EVA; lightweight with excellent cushioning and durability.