Which is better for motocross racing?

The 6D ATR-3, because it holds FIM 02 and ECE 22-06 approval and adds ODS rotational protection. The SM3 is DOT and ECE 06 certified, which covers most club and trail use.

Is the 6D ATR-3 worth the extra money?

If you race under FIM rules or crash often, yes: the carbon shell, ODS liner and rebuildable design justify the gap. For casual trail riding, the SM3 at $229.95 at Walmart covers the basics for far less.

Which helmet is lighter?

The Alpinestars SM3 at 1310g in ECE trim, against about 1350g for the ATR-3 in size M/L. The gap is small, roughly 40g.

Which has better ventilation?

The SM3 lists 10 inlets and seven exhaust ports. The ATR-3 lists large intake vents without a published exhaust count, so the SM3 has the clearer ventilation spec.

Can the 6D ATR-3 be rebuilt after a crash?

Yes. 6D sells the ATR-3 as a rebuildable design, so liners and components can be replaced. The SM3 is not rebuildable.

Do both fit the same head shape?

The ATR-3 is listed as intermediate oval with optional cheek pads for fit tuning. The SM3 comes in sized shells with multi-density EPS cut per size. Try both if you can.

Alpinestars SM3 Solid Helmet vs 6D ATR-3 Helmet

The 6D ATR-3 is the stronger helmet on paper: it carries FIM 02 and ECE 22-06 certification, a 3K carbon shell, ODS rotational protection and a rebuildable design. The Alpinestars SM3 is a solid entry-level motocross helmet with DOT and ECE 06 approval, 10 inlets and seven exhaust ports, and a 1310g ECE weight. At $229.95 at Walmart versus $849.99 at eBay as of November 6, 2026, the SM3 costs about $620 less. Buy the SM3 for budget trail and track riding; buy the ATR-3 if you race under FIM rules or want the carbon shell and rebuildable construction.

Today the Alpinestars SM3 Solid Helmet costs $620.04 less at its best price.

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