Perhaps you've got a day in town planned or a hike at the local park penciled in. Whatever's in store, these sneaker-inspired hikers know how to adapt with a sturdy yet breathable upper, SensorFlex(TM) technology, a waterproof membrane to block out the elements, and a three-layer, lugged outsole that looks sharp on the sidewalk yet has the rugged, versatile strength to tackle the trails.. . Premium leather and mesh fabric upper. Silver-Rated Tannery: One or more major components use at least 50% leather tanned in a facility rated Silver or higher by a third-party environmental audit. The Leather Working Group judges and classifies tanneries based on energy use, waste production, and water treatment.. TimberDry