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The Alpinestars SM3 is a full-face motorcycle helmet built around a varied-thickness shell and a six-piece EPS liner in three densities. Its polished inner EPS coating is designed to let the comfort liner slide, helping manage rotational impact. One outer shell covers two inner EPS sizes, and optional +/- 5 mm cheek pads let riders fine-tune the fit. It suits street and sport riders who want a light, protective helmet with a breakaway visor, though it lacks the MIPS-style slip liners and premium linings found on some rivals.
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The Alpinestars SM3 is a helmet built with a varied-thickness shell. This construction is designed to optimize protection while keeping weight low.
Inside, a 6-piece EPS liner uses three different densities. The inner EPS liner is polished and has a special coating that reduces friction with the comfort liner, which helps manage rotational impacts.
The helmet comes with one outer shell size and two inner EPS liner sizes. Optional +/- 5 mm cheek pads allow a more tailored fit. The visor is a breakaway design.
