Details: Â Chaco Zong X EcoTreadâ¢ Take the relaxed route in the Chaco Zong-X Ecotread. This sporty women's sandal features a polyester webbing double-strap upper with a toe-wrap for side-to-side forefoot stability. The adjustable 360Â° Wrap-fit straps conforms to the curvatures of the foot for a secure fit, while the BioCentric footbed supports the arch. The lightweight EcoTread outsole of this Chaco sandal is made from 25% recycled rubber for eco-friendly consideration. Slip into the Chaco Zong-X and set out on your adventures in comfort! MaterialsPolyester webbing upperBioCentric footbed with PU formulation25% recycled EcoTread rubber outsoleWeight9 oz.Country of OriginChinaItem #J100340, J100342, J100344, J100346 1 NeckReduces the occurrence of posture-related neck aliments2 BackMinimizes strain on the back muscles and helps maintain proper spinal alignment3 HipPrevents internal rotation of the femur, which alleviates pelvis tilt and reduces strain on the hamstring and gluteus muscles4 FemurReduces internal rotation and eliminates strain on the IT band, decreasing IT band friction syndrome5 KneeAlleviates strain on the knee joint, preventing bursitis and medial knee injury6 ShinReduces torsional strain on the tibial muscle structure and the incidence of shin splints7 FootHelps prevent over pronation, plantar fascitis, and various injuries to the foot Lasting arch support controls pronation.ChaPU (polyurethane midsole provides durability for years of adventure.Heel risers increase lateral stability.Multiple widths ensure proper comfort on your adventure. 10 Step ChallengeWatch the 10 Step video to learn about the ADDSTRIDEâ¢ footbed, how it affects your walk, and the benefits it provides your body!