Seat belt systems can be considered as the most convenient and practical system for occupant protection in automotive crash situations.Takata Kojyo Co., Ltd. has been striving to design and create a seat belt system that would be both practical and effective in absorbing impact energy with no injury in high speed crashes.In our search for more effective seat belt systems, we have conducted various comparison tests between conventional webbings and our newly developed webbing in regard to rheological property.1. In regard to the dynamic performance of the webbing, the quantity of absorbed impact energy and the rate of absorbing energy were obtained and compared through tests at various impact speeds.2. Dummy tests were conducted in our laboratories to compare the improved Takata energy-absorbing (EA) webbing with conventional webbing. The results showed the conspicuous superiority of the Takata webbing over the conventional types.3. Using our improved webbing, two live human volunteers were able to successfully complete tests at impact speeds of 30.3 and 30.4 mph without injury or pain.4. In the future, to enhance safety, seat belts, as well as other restraint systems, should be evaluated with the use of dynamic tests with living human volunteer subjects rather than with anthropomorphic dummies.