The UTV Helmet Support comes in 6 sizes to accommodate almost any size person. There is no exact right measurement for each person, as it is all about personal preference for your intended use.
Step 1 - Measure your neck diameter in the mirror.
Step 2 - Put your helmet on and measure the distance from the bottom of your helmet to the top of your shoulder.
Step 3 - Using the two measurements you just made, determine the best device for you using the UTV Helmet Support dimensions chart.
A few things to consider: -If you want the collar to cushion your chin instead of your helmet, adults can consider a youth size collar as long as your neck can fit the smaller 5" diameter hole. -If you want the collar to hold your head tighter, opt for the thicker version. -If you want the collar to allow a bit more movement, opt for the thinner version.