Supple full-grain leather, a Vibram® MegaGrip outsole, Adaptive Cushioning Technology (ACT) and other upgrades all make the Bridger Premium Mid Waterproof stand out above our beloved flagship hiker. The ACT in the Bridger Premium uses Intelligent PU™ specifically tuned for minimizing Impact for a lightweight midsole that has long-lasting durability, support and rebound for optimal comfort.