Inov8 TrailFly Ultra G 280 Trail Running Shoes Prepare to run lighter, with a softer ride, greater bounce and more underfoot trail control. The new TrailFly Ultra G 280 gives trail runners the ultimate in long-distance performance. Boasting a new nitrogen-infused midsole foam that is light and sustainable, you'll feel connected to the trail like never before in running shoes that flex and spring while cushioning your every step. Inov8 Shoe Fit Scale For technical footwear, a good fit is essential to enhance your performance. Inov8's new Shoe Fit Scale makes it easier to find the perfect fitting shoe. All Inov8 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. The shoes are now graded from 1 to 5, Grade 1 representing their closest, most precise fit and Grade 5 representing the widest fitting toe box. The lower the number on the scale, the narrower the fit, which ensures minimal internal movem