A protective helmet with outer hard plastic shell and internal inflatable bladder arrayed in a particular semi-elliptical fluidic circuit of known elasticity and defined pattern. The bladder is a long thin TPE rubber tube having a valve mounted centrally at mid-length. The tube is mounted inside the hard plastic shell such that the valve protrudes centrally through the hard shell and outward just beneath the occipital bone at the rear of the wearer's head. Inside the tube bisects into equal-length non-return fluidic patterns one on the right-side of the head and one on the left. Each fluidic pattern comprises a semi-ellipse, running continuously up to the temple and looping up and around from temporal-to-frontal-to-parietal sections of the human head, and terminating approximately at the occipital portion. Mesh netting is provided over the tube as a liner layer against the head. The invention vastly improves impact protection, yet is lightweight, flexible, and comfortable to wear on a continuous basis.