A Gore-Tex® XCR waterproof-breathable membrane makes our award-winning Evolution Mid GTX the ultimate all-season trail shoe. This supportive mid-height design gives you confidence to take on the toughest terrain. NestFIT system cradles your feet, accounting for every contour as it follows the natural flow and design of the foot. Upper, insole, midsole, and outsole come together like never before. IceLockTM/HyperGrip® sole provides traction in all conditions. Lightweight, variable-density Zero GravityTM EVA midsole joins the sole and insole to create a supportive whole. Triple-density EVA insole supports the arch, cushions key strike zones and strengthens your stride. Durable, quick-drying synthetic upper. GORE-TEX® XCR waterproof-breathable membrane for dry feet. IST SOLE: Anatomical sensor zones recognize and respond to terrain for a pure connection between runner and trail.