Extremely breathable synthetic upper. Seamless Upper Zone engineering upper design (S.U.Z.E.). Ion-Mask? hydrophobic technology. Heat seal overlays for lightweight support. TPU shank support with ESS protection. Molded toe cap, reflective safety details, and microfiber collar lining. Comfort-Tec contoured footbed. Dual density 3D counterbalance midsole, lightweight TPU shank, and exclusive dual density Vibram? outsole.