This double strap configuration provides an extra level of comfort, especially for those with irregular foot shapes. Soft polyester webbing dries faster than nylon and maintains a consistent fit in all conditions. Chaco's original pull-through strap system provides complete adjustability, while eliminating the bulk and stiffness of overlapping hook-and-loop closures. New lighter PU formulation makes this sandal as light as competitive products made with less durable EVA. Anatomic strap placement cradles the foot at the first and fifth metatarsal bones for biomechanical comfort. Narrower, double straps create a comfortable basket weave that delivers secure support and comfort. Construction guarantees a long-term relationship and eases environmental stress when re-soled. 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. BioCentric footbed: ; Aggressive arch support controls pronation. Sculpted heel cup centers the foot's natural shock absorbing pad under the heel bone. Heel riser increases lateral stability. Multiple widths ensure a proper fit.