What is DDR (Dual Density Rubber)?
DDR Sole Technology is made up of a rubber midsole and outsole layer. The chemical bond between these layers is so strong that glues are not needed to hold them together. The rubber fuses to the upper as it is applied using heat and pressure, this means that it does not suffer from adhesive failure. DDR uses high density rubber that is highly abrasion resistant, slip resistant to SRC, and heat resistant to 300°C. DDR is the best sole compound for people working in the toughest environments such as groundworks, construction, engineering, utilities and rail.