What Our Gearhead(R) Experts Are Saying:"I've been putting the Sertig TR Low GTX Boot through its paces on technical mid-distance runs and the combination of the high-rebound midsole and Mammut Swiss Design outsole gives a really confident, responsive ride on varied terrain. The GORE-TEX lining kept my feet completely dry through a soaking wet descent without any of the clunky feel you sometimes get from waterproof trail shoes."There is a specific kind of trail run that lives in the middle distance, long enough to demand real cushioning and grip, fast enough that dead weight underfoot becomes something you actually feel by mile six. The Mammut Sertig TR Low GTX Boot was designed for exactly that effort. Lightweight and flexible with a flex index that keeps the foot moving naturally through technical terrain, it brings the responsive, ground-sensing quality of a true trail runner without leaving protection behind. The Mammut Swiss Design outsole delivers grip and responsiveness across the variable surfaces that mid-distance mountain terrain tends to serve up all at once, wet rock, loose dirt, rooted singletrack. The GORE-TEX Invisible Fit membrane handles the weather without adding perceptible bulk, keeping feet dry through stream crossings and surprise rain without the stiff, waterproofed feel that slows some shoes down. A breathable air-mesh forefoot keeps airflow moving on the climbs, the high-rebound midsole absorbs impact over the long haul, and a foam-lined ankle collar cushions and secures the fit right where it matters most on technical descents.