MOZO Men's Red Skull Work Shoe 100% Synthetic Rubber sole Heel measures approximately 1.5" Relieve everyday stress and fatigue with the ultimate comfort of the Sharkz shoe by Mozo&#174;. Sharkz "Uniframe" technology provides comfort through an injection molded process. Casual, comfortable, stylish and lightweight MOZO slip-on for people on the go. Broad toe area for all-day comfort. Gore side stretch offers easy in-and-out comfort and fit. Sidewall ventilation aids in moisture control and cooling. Gel-cushioned insole for shock absorption. Full length midsole for all-day comfort. Orthotic friendly. Ergonomic shape for a better fit. Customizable Fit (MOZOFit&#8482; System Technology) allowing you to adjust the fit of one or both shoes with two shims. The blue shim is located underneath the gel insole and the black shim is included in the box. Spider Traction&#8482; slip-re