Polyester mesh and textile upper materials. Bungee speed lacing system allows for easy on and off, and a snug fit. Soft lining offers a great next-to-skin feel. Lightly padded, 2 mm EVA insole features antimicrobial properties for a fresher in-shoe fee. Max Outsole Thickness: 4.7 mm Vibram outsole delivers reliable traction over a variety of surfaces. Lightly padded tongue & speed lacing system Serrated blade lug design Xs trek outsole Zero drop