Built for all-around, heavy-duty wading, the Simms Rivershed Boot features Simms' StreamTread platform for support and traction whether you're going out for a quick fishing session before work or taking a week-long trip of a lifetime to Yellowstone. Simms designed this tough puppy for reliable performance and maximum durability, using waterproof synthetic leather and ballistic textile material for the upper and full-perimeter scratch rubber for added toughness. It lined the thing in neoprene for warmth and cushioning and gave it a 3mm Vibram Idrogrip rubber outsole for traction on slick rocks.