Design inspirations from our work with the military are now available in civilian trim with all the comfort you expect from Oakley footwear. We shielded FLAK SIX from weather by waterproofing the full-grain leather and adding a liner made of eVENT®, a waterproof synthetic that optimizes breathability. This boot takes to terrain with the bite of directional tread and the grip of high NBS vulcanized rubber. For superior shock absorption, itâs primed with EVA in the midsole and polyurethane in the footbed. The styling will take you through urban jungles but the performance begs for unconquered territory.