The Grand Dru GTX is designed for heavy-pack hiking in rugged terrain. It features a waterproof, breathable GORE-TEX Performance Comfort membrane and a siliconized Perwanger suede upper with a protective rand. The high flex cuff offers crucial ankle support, while the stiff PU and TPU midsole is paired with a Pro-Fiber XT 20 insole. The aggressive Vibram sole is optimized for primitive mountain trails.