1. MEASURE YOUR HEAD. Determine the circumference of the widest part of your head by using a flexible tape measure. Generally, the widest part of a person's head is the area 2.5 cm (1") above the eyes and ears.
However, we suggest measuring at a few points both above and below that line to determine the greatest measurement before referring to our size tables.
We also suggest testing the fit of a helmet one size smaller and one size larger than what the chart recommends. No helmet can provide protection if it's too uncomfortable to wear.
Comment: I bought this helmet because I could get orange, which is a high visibility helmet. I bought a compatible face shield. I love this helmet I bought a medium which was a great fit.
ZR1 Jimmy Retro Helmet Review
Comment: I feel this is a quality helmet and it looks nice too (silver with black stripe). I am a female with pretty thick hair. I originally ordered a Medium because my head measured 22, but it seemed a bit lose (I could stick 2 fingers underneath at my forehead). So I re-ordered the small and it fits perfectly, not too tight, but just right. So it might run a bit large (for women). Easy to order, and was nicely packaged so it wouldn't get damaged in shipping. I was impressed and I'm very happy with this helmet!
Best Answer:you pay shipping back. of course, you already paid shipping to yourself, so you're out $25 or so. the problem is not that, really, but that their sizing is so off that you're likely to pay shipping two, four, six times.