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The outsole on the Peregrine ISO is my favorite feature of this trail running shoe. This design provides the most of rubber to trail contact of any outsole on a trail running shoe while giving the lugs enough separation to work independently to flex and grip on to uneven trail surfaces. The entire surface of the outsole is covered in lugs vs having intermittent lugs throughout the outsole. The traction on the Saucony Peregrine ISO trail running shoe is one of the most unique outsoles in the trail running shoe category. Mountain Goat Like Traction & Super Soft Ride The toe box of this trail shoe has a standard fit, it’s not too narrow, yet it doesn’t go super wide like an Altra trail running shoe. The tongue of the Peregrine ISO is sewn in on each side of the shoe, which helps provide a more secure fit and keeps it from sliding to one side of the shoe. This extra padding around the heel also keeps it from going up and down too much when running uphill. There is a good amount of cushion that wraps around the ankle that helps keep your foot from sliding around too much when you have a lot of lateral movement running technical trails. When you slide your foot into this shoe for the first time, it’s like your getting into a brand new luxury vehicle. For having a smaller upper compared to other trail running shoes, the Peregrine ISO is incredibly plush. The upper on the Saucony Peregrine ISO is has a low profile giving you the feel of a minimalist trail running shoe while giving you just the right amount of cushion and stability. It’s durable, has a super soft ride, is lightweight and provides excellent traction on all sorts of trail surfaces. The Peregrine ISO is everything you want in a trail running shoe. The Saucony Peregrine ISO has been one of my all-time favorites for trail running shoes.