The 360 Plus Device is definitely a different approach to filling the requirement of wearing a neck collar. The molded, glass filled nylon core piece, along with the firm chin foam parts, provides a stable platform for helping control the movement of drivers head when needed.
Major issues the 360 Plus Device helps limit is front and rear hyper-flexion, extreme lateral motion, and the relief of a compression load. This is all accomplished while still allowing the driver unrestricted rotation of the head to look over the shoulder for oncoming karts.
Using a tape measurer, measure around the driver's neck to determine the neck size. Find the size on the chart below that is the best match to your measurement.