INOV-8 Men's F-Lite 235 V3 Black/Gum Training Gym Shoes: product description The new look men's F-LITE 235 V3 is an all-natural, lightweight and flexible training shoe. Designed around natural movement and utmost comfort, this shoe also boasts a list of protective technologies and brand new features to make it the ultimate supernatural functional training shoe. We have graded the fit of all our shoes from 1 to 5 to make it easy for you to find the perfect fitting shoe. All our shoes are designed with Met-Cradle technology to lock down the mid-foot for a stable hold. Where they differ is in the toe box. Grade 1 represents our closest, most precise fit. At the other end of the scale, Grade 5 has the widest fitting toe box. We have meticulously studied the foot and its function during the gait cycle and also the interaction between the foot and the terrain. We have used this knowledge to develop our fitting scale. For technical footwear a good fit is essential to enhance your performance. As a rough guide, Grade 1 represents an industry B fit, while Grade 5 equates to a 2E fit in the forefoot. INOV-8 Men's F-Lite 235 V3 Black/Gum Training Gym Shoes