Sparcos neck collars have been homologated by a team of eight physicians who evaluated their reliability in terms of neck protection from very strong impacts. Padding of differentiating densities are employed and covered in Nomex III fabric.
OMP racing collars are designed to prevent the weight of your helmet from over extending your neck and causing serious injuries to the spinal column. Nomex III covering, high density foam, and velcro closure for entry and exit give superior protection to the driver.
Momo Corse neck collars are to support the helmet under high G-forces to reduce strain and whiplash injuries. Covered in Nomex III and FIA approved.