Chaco - Z/1 Unaweep (Black) - Women's: Open toe design allows for use with socks or booties. Soft polyester webbing dries faster than nylon and maintains a consistent fit in all conditions. New lighter PU formulation makes this sandal as light as competitive products made with less durable EVA. Sculpted heel riser provides foot stability and greater heel-side comfort. Chaco BioCentric footbed, in two widths, provides all-day comfort and controls pronation. Chaco's taken the most intelligent features from their Colorado and Terreno soles and built them into the new Unaweep hybrid. Lug pattern and spacing make this sole virtually self-cleaning, and with Vibram durability, the Unaweep is ready for the trail; sand, stone, or submerged.