Nubuck Leather Upper Robust and durable to extend the life of your boots. It is also open pored for breathability while remaining fully waterproof. Gore-Tex® Lining Allows for moisture and sweat to escape while preventing water from entering from the outside. C4 Tongue Reduces pressure on the instep and allows for improved flex and comfort. X-Lacing® Stud Reduces tongue movement and prevents pressure and blisters from forming. Roller Eyelets Allows for quick and easy lacing with minimal friction. Medium Flex Stabilizer Provides sturdy underfoot support while retaining forefoot flex. Polyurethane (PU) Midsole PU midsoles do not deform under heavy packloads so you can carry more without compromising weight and flexibility. SPS System Optimises foot stability to provide added comfort when walking. This system corrects gait by reducing pronation and supination (feet rolling inwards or outwards). Vibram® Natural Outsole Provides good grip on diverse terrain and allows you to ascend and descend with ease in challenging terrain. This outsole is resolable.