If we are out of stock in your size, check out the AK1 or the AK66
Use a soft tape measure or piece of twine about one inch above your eyebrows.
Make sure the tape is level all around, make it comfortably snug, not super tight.
If your measurement falls between sizes, we recommend choosing the smaller size as the snugger fit will be more comfortable and safer.
Measure carefully using this chart to determine your size: