Light, waterproof, dynamic, and reliable even on the most difficult trails. The Men's Rocket DFS GTX adopts the innovative Vibram Traction Lug technology that improves traction and grip by up to 25% thanks to the special design. With our exclusive AKU Dual Fit System (DFS) technology, you are able to quickly and efficiently adjust the precision of the fit by simply acting on the two different lacing systems.