chaco zx3 classic sandal - women's hollow eclipse 9 chaco streamlined and dependable since 1989, our classic series is comprised of only 8 component parts, making for the simple, timeless sandal design that made our name. every pair of zx/3 sandals comes standard with adjustable triple-straps that custom-fits to your foot, a toe-loop for additional forefoot control, plus our podiatrist-certified luvseat pu footbed for all-day comfort and support. now featuring chacogrip rubber for our best performing classic outsole to date. experience our classic sandal like never before.