White's offers the best performing and best selection of PACS in the logging industry. Each calk receptacle is inlaid into a special new fiberglass-rubber sole. Traction and support are maximized because there's no calk slippage or turning. Yet, flexibility and comfort are maintained because the outersole in rubber. A steel shank provides firm arch support. The Logger Pac is hand-crafted with White's triple-lock stitched, durable full grain leather upper, false tongue brush guard and nylon laces. Logger Pac is only available in Black and Gray. Calk wrench is included with your boots.