RUSH 2 PRO GTX Mens is the nubuck version of the RUSH 2 family. This shoe has hybrid nature in terms of stability and support of the foot, with a structure superior than a trail running shoe, but with more agility than most hiking ones. The rigid TPU heel structure and the EVA midsole provide stability and a more even distribution of cushioning. Scarpa Mens Rush 2 Pro GTX Features: IKS (Interactive Kinetic System) technology that reinvents the principles of comfort and cushioning GORE-TEX ePE, with low environmental impact Upper Nubuck Idro PFC Free 1.6-1.8 mm + Mesh Lining GORE-TEX ePE Most Breathable Bluesign Sole Presa HIK-03 Weight 405 g ( pair size 42)