


*ONEAL SIERRA II Flat Adult Adventure Helmet
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
*ONEAL SIERRA II Flat Adult Adventure HelmetSIZING CHART Whether you ride on the pavement or the dirt or both the Sierra II has the features you need for your next two wheel adventure. Combining a full windscreen and a visor with a drop down tinted shield, the Sierra II helmet will get you anywhere you want to go. FEATURES: Shell is constructed with ABS Weight: 1590g (50g) Moisture wicking, removable washable air channeled comfort liner Vent holes for optimal ventilation Integrated face shield
Quick Dispatch:
Your *ONEAL SIERRA II Flat Adult Adventure Helmet orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
Order Tracking:
You'll receive a tracking link by email once your *ONEAL SIERRA II Flat Adult Adventure Helmet ships.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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4.4 ★★★★★
Based on 496 reviews
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Product Reviews
★★★★★ 5
Finally a waist that fits!
Size: 8, Color: Graywhite 4p
I have a skinny 9yo and we always have issues with pants, jeans, shorts, pyjamas etc. being too big in waist. I was absolutely stunned that these actually fit him without the need to be taken in!!! But there is still plenty of stretch for bigger bellies. The shorts are a little longer than what we're used to for pyjamas - they go down almost to the knees, but the kid likes it. Although he's 9, I ordered size 8 and they fit great. Will get another set!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 13, 2025
★★★★★ 5
Bellas
Size: 13 Little Kid, Color: Pink/Glitter
Son una belleza quedan muy lindas puestas se las recomiendo para las niñas de la casa
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 7, 2025
★★★★★ 5
Comodas
Size: 2 Big Kid, Color: Black/Beige, Size: 2 Big Kid, Color: Black/Beige
Muy cómodas , cojen el estilo q te pongas. Vienen súper reducidas. Tuve q comprarle un #5 a mi niña con 22cm de largo. A pesar de q llegaron con un polvo blanco, parecían usadas, pero en general super
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 22, 2025
★★★★★ 4
Heavy.
Size: 2 Big Kid, Color: Pink/Glitter
They are beautiful, but too heavy to my kid.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 20, 2025
★★★★★ 5
Runs small
Size: 4 Big Kid, Color: Pearl Yellow
I wish they went past size 4 but cute nonetheless.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 29, 2024
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