*ONEAL SIERRA II Flat Adult Adventure Helmet

*ONEAL SIERRA II Flat Adult Adventure Helmet

Marsoni

M251S

$199.00

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

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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

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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.
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Very happy with this car mount. The magnet is plenty strong to securely hold my iPhone in its magnetic loop case. It’s plastic but it’s sturdy and fits on my Model 3’s screen perfectly. It has an adjustable height that I can mount my phone with full clearance of my steering wheel. Don’t waste your money on a metal mount, this inexpensive mount serves the need perfectly.

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Reviewed in the United States on April 22, 2026

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Anthony Jones

Charlottesville, US

★★★★★ 5

Great for Tesla

Color: Black

Perfect in my Tesla. It’s sturdy and never drops my phone.

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Reviewed in the United States on May 23, 2026

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WillB

New York, US

★★★★★ 1

Mount presses on the back of the screen Too hard

Color: Black

Waste of time. Doesn’t mount well. The screen shows visible backlight stress from where the mount presses on the back of the screen Returning it same day

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Reviewed in the United States on May 13, 2026

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I Agoren

San Leandro, US

★★★★★ 5

Good option for FSD drivers with a thin skin

Color: Black

Works great. Holds the phone very well and can be repositioned very quickly to accommodate various driving modes like laid back and deep or focus edge of your seat with getting yelled at by FSD (not really self driving)

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Reviewed in the United States on June 1, 2026

Verified Purchase

As unique ink

Fort Morgan, US

★★★★★ 4

Easy install

Color: Black

Sometimes it falls off if you hit a bump but it’s very durable. Functions well. Magnetic strength is impeccable. Easy installation

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Reviewed in the United States on April 21, 2026