The Isaac™ head and neck system was designed to minimize
head and neck injuries suffered by racing drivers during crashes. This
injury (basilar skull fracture) occurs when the harness system stops the
body but the head keeps moving. Unlike "head restraints," which hold the
head in position, Isaac™ uses shock absorbers to offset dangerous head and
neck loads caused by the impact.
In tests conducted at Wayne State University's Bioengineering Center,
where NASCAR tests safety components, Isaac™ performed as well as any
product available, reducing the load on the unprotected head from about
1,700 pounds (7.5kN) to only 299 pounds (1.3kN).
Isaac™ was designed to meet the following