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 innersole. Exclusive dual density Vibram? outsole, dual density 3D counter balance midsole, and lightweight TPU shank.