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"Helmets (Snell 95 or better) are required" - Islands Site
The Snell specs are updated every 5 years, so the newest helmets carry "SA95" or "M95" ratings. A helmets must have a Nomex liner and are, therefore, more fire-resistant than M helmets.
In order to get the Snell rating, both types of helmets must pass a series of identical impact tests. In addition, the SA helmets must pass a test designed to simulate impact with a rollbar.
Also, the "SA" standard allows a minimum eyeport size that's smaller than the minimum allowed by the "M" standard.
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