The venerable Yellowstone is an Oboz classic. Built on the versatile and burly Sawtooth outsole and packaged with the BFIT Deluxe Insole, the all-leather, waterproof Yellowstone II is happiest exploring as far from the trailhead as you can take it. Bfit Deluxe Insole - A supremmely supportive insole, engineered specifically for Oboz shoes. The Bfit Deluxe Insole stabilizes arches, protects high-impact zones, and cost nothing extra. Molded Heel Counter - Snug heel hold that's built to last. Oboz mold this heel counter, making it extra durable against collapse. BDry Membrane - Keep dry when the trail isn't. Oboz proprietary BDry membrane blocks water from wet trails while wicking sweat away.