The slip-on ease of a flip-flop with the forefoot security of a performance sport sandal the Chaco Zong sandal takes its name from the venerably popular thong and the Chaco Z/2 sandal. A heel strap is absent from this design but a toe loop makes a secure anchor point for the big toe to provide precise forefoot control. In fact many hardcore adventurers prefer this forefoot design for canyoneering trail running and rafting. The soft polyester webbing is quite comfortable even for those who typically can tolerate nothing more than sand between their toes. And unlike a thong the Chaco Zong men's sandal does not scoot backward rubbing between the toes. Although the strap system is suited more for casual endeavors than an approach to a big wall climb the Chaco Zong sandal still offers features on par with Chaco's performance models. A Vibram® outsole firmly grips a wide assortment of surfaces and the BioCentric™ footbed contour cradles the foot in the neutral position a healthy posture for the feet legs and spinal column too as it promotes a proper stride.