NINE MAX Foam Cervical Collar Soft Neck Support Brace Adjustable Neck Collar;

How to Measure
You should measure the distance from the top of the collar bone to the bottom of your chin.
First, keep your head looking straight forward that will give an approximation of the correct size and level of support for you.
Next step, you can measure using your thumb on the collar bone and index finger under the chin, then place the distance of this against a ruler.

?Washing Instructions?
Hand washing recommended. Also machine available-Close velcro, mesh laundry is recommended, stretch the brace while wet and let dry.