Apex Pro Vibram Arctic Grip All Terrain (Men's) Colours:BLACK 2 Flow (L min): 1 liters Colours:ACID LIME BLACK 2 Flow (L min): 1 liters per min Flow (strokes per liter): 60 Cartridge life: 2000 liters Field cleanable: Yes Field maintainable: Yes Water Bottle Adapter: No Cartridge replacement indicator: Yes Material(s): Hollow Fiber Country of Origin: Made in USA comfort and control in an easy to use tubeless system The new Vibram Arctic Grip All Terrain outsole with Vibram XS Trek Evo compound and New Traction Lug Technology provides advanced traction on all terrains including wet ice Combining Vibram's All New Arctic Grip All Terrain outsole with XS Trek Evo compound and their New Traction Lug Technology for added durability and grip on wet and dry surfaces