Review on Welder Nation: Welding Safety & Occupational Health Products - Personal Protective Equipment (PPE) by Logan Collier

I was able to get a flexible tape measure before ordering. Just measure the part of your head where you will wear it. If you would like it to sit on top of the ears, please include the top of the ears in your measurements. I was in the middle between sizes so I went for the larger size and I really like these baseball caps.