protector cervical alpinestars k ringK RING COLLAR (2022) The Sparco K ring is an anatomically designed 360 degree collar that offers safety and comfort. Extensive testing by a panel of specialists showed how effective this collar can be at supporting the neck during crash tests. The Sparco K ring is made from high density foam that provides firmer support in the event of an impact. Sternum and upper back supports allow for better energy absorption at the shoulders to minimize the risk