Protective headwear to reduce risk of injury

A method of forming a helmet to protect a human head against mild traumatic brain injury upon impact comprising:

• forming an outer shell larger than the head;
• forming a liner comprising fluid fillable flexible fluid chambers fluidly connected to at least one other chamber that fit inside the outer shell around the circumference of the helmet, the flexible fluid chambers being configured to fill a space between the head and the outer shell when the helmet is positioned on the head;
• connecting each group of flexible fluid chambers with a fluid connection, so that each group of flexible fluid chambers is interconnected;
• filling the groups of interconnected flexible fluid chambers with fluid;
• forming impact resistant flexible pads in the liner spaced around an inner circumference of the outer shell adjacent to each of the flexible fluid chambers;
• forming a flexible inner shell inside the liner, configured to fit closely on the head;
• attaching the flexible fluid chambers and flexible pads to the inner and outer shells to form the helmet such that the flexible fluid chambers are configured to compress in response to impacting of the helmet on an impact side, and force liquid through the fluid connections to inflate other fluid chambers in the helmet, thereby cushioning the head against a rebound impact on helmet;
• and
• attaching a chin strap and fastener to the helmet.