Alpinestars S-M3 Radium Adult MX Helmet

Marsoni

M251S

$179.95

Get it in 3 business days with 1 day shipping. Friday, May 29

Alpinestars S-M3 Radium Adult MX HelmetEngineered for MX, Enduro and off road riding, the SM3 Helmet integrates advanced technologies and innovations designed to enhance ease of use, comfort and impact protection. Features: Advanced Shell Construction: This helmet features a thermo injected shell incorporating a special polymer blend enhanced by varying degrees of thickness that is engineered to deliver the optimal combination of impact protection and lightweight. The SM3 medium weighs

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Exchange/Return Notes

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This was purchased for my 3-year-old - we NEEDED a purple shirt with a cat. This worked for both. It's an odd material - it says 100% cotton, but it's slippery and doesn't seem like it would breathe well. For a kid's shirt, the price is great. I would not buy a matching one for myself, but that's okay, I don't need a purple cat shirt. The 3T fits more like a 2T, and she's growing out of it fast. I will be buying it again in a 4T and hoping the sizes are consistent. It was a huge hit for the kiddo.

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Reviewed in the United States on June 8, 2026