Perforated neoprene on the outside of the arm & stretch material on the back

then you need the 100% Trajecta

Weight: 329g

you can change it to a 180mm travel down the track

Hope RX Gravel Crank Arms - 68-73mm and BB86-92 - 30mm - Hope Direct Mount - 175mm - Orange Do Not Ship Internationally Perforated neoprene on the outsideThe RX Crankset is Hopes latest step into the Gravel and Road world, following their successful RX4 callipers and RS4 hubs. A two piece hollow design allows for the removal of any unwanted material increasing stiffness and reducing weight. Features: Two piece hollow construction Fully CNC machined for precise material removal 30mm aluminium axle Compatible with almost every BB system with our extended range of BBs 170, 172. 5 and 175mm arm length