Some shoes are shaped like trucks. The Ultra XTreme Terrain was modeled after the great reef shark, a superbly agile predator whose sleek, efficient silhouette is one of nature’s crowning achievements (unless of course you happen to be its prey). The outsole is super-sticky and aggressively cleated for traction on any surface. Equipped with GORE-TEX® XCR waterproof, highly breathable membrane-lined Cordura, compression-molded CMEVA midsoles with ECCO’s wickedly effective DynaThane PU inserts this shoe is willing and able to keep you comfortable during your most venturesome exploits.