Dr. Martens - 8699 Series - BEX Flex (Black Grizzly) - Footwear This Terrain favorite has styling reminiscent of the most classic of hiking boots. Welted to Dr. Martens flex BEX sole, the lace-to-toe D-rings and tunnel-loop add a practical twist to these comfortable favorites. Grizzly is tumbled leather for softness while maintaining a rugged full-grain appearance