Note: Helmets tend to run small. After measuring, manufacturer recommends ordering one size up.
Measure circumference of head and reference: Small (19"-20") Med.(21"-22") Large(23"-24") XL(25"-26")
FLEECE LINED GOATSKIN FLYING HELMET
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It does not have open ear flaps for a headset. However, it appears that you could wear the in ear style headset inside the helmet with little discomfort. There is no reference of customers using these two together, but we don't see it as being too big of an issue.