Description Of Chaco ZX/2 Unaweep The forefoot control of our classic Z/2 combined with the added support of our double-strap design make this style popular among long-distance hikers and river runners. Equipped with the Chaco pull-through strap system and BioCentric™ footbed, the Chaco ZX/2 is all about fit—from steep mountain hikes to deep river crossings, you'll be hard pressed to find a performance sandal that sticks to your feet as well as the ZX/2. Break through all boundaries with the Chaco ZX/2 Unaweep. Features: Unaweep: The suprisingly light-weight Unaweep outsole is an intelligent combination of slip resistance and traction. The angled, well spaced lugs make this non-marking sole virtually self-cleaning.