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The noise doesnt get that much louder at speed and the noise seems to be mostly in the midrange frequencies with very little booming and no whistling
Giant manufactures its own proprietary ALUXX aluminum frames, which utilize a high-strength 6061 (or a 6011, if you use the SL OR SLR models) alloy and reinforced, butted tubing
While ATV helmets maximize ventilation and minimize weight, snowmobile helmets are packed with thicker insulation (which makes them heavier) and they block as much outside air as possible to stay warm
Its also made in six sizes rather than the original three, which makes it easier to get a correct fit, though goes against the original ethos of making drastically fewer sizes to reduce tooling and manufacturing costs
Product No: 234215
9 vents specially adapted for a smaller shell including quadruple inset duct system provides great ventilation at all times, allowing the helmet to be used in even the hottest weather
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