Deer Tracks Hoopoe Ophelia Mid Winter Boot (Women) - BlackHidden Depth By using durable direct injection technology we are able to make our footwear more esthetically pleasing by hiding some part of the extra depth in the body of the outsole. This also achieved by use of strobel construction, which helps to eliminate extra layers of cardboard. Extra light weight Use of exclusively formulated materials for outsoles as well as unique uppers constructions provides for almost weightless shoe experience.