Salewa Men's Mountain Trainer Mid GTX Hiking Boot 100% Leather and synthetic Imported Synthetic sole Integrates salewa's patented technologies to offer the alpine fit 100% blister free guarantee. Customizable multi fit footbed plus (mff+) with interchangeable layers so you can adapt it to the unique shape of your foot. Climbing lacing right to the toe for a more precise fit. 3f system for firm ankle and heel support. Adaptive foam padding in the heel area.