I see Troy Lee's sizing is a little bit different to "normal"... xs/s, m/l, or xl/xxl.
I measured my noggin, at 23.5"...according to Troy Lee, in the D2, the m/l goes up to 23.3", and the xl/xxl starts at 23.7"...hmn...
Right now, I wear a Giro Flint Full-Face in a Medium.
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