Saucony Kinvara running shoes are a natural, neutral shoe featuring a 4mm heel to toe drop. The Kinvara 8 are the most energised Kinvara ever. They feature a full length Everun topsole and stripped down upper to give back more energy with every stride while cradling the foot only where it's needed most. FlexFilm - thin, flexible film welded onto the upper which enhances fit without adding weight. Highly flexible outsole provides greater ground contact and freedom of movement.