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O'Neal Sierra Helmet

  • Based on 627 reviews
Condition: New
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$144.98 Why this price?
Save $15.01 was $159.99

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Availability: In Stock.
Fulfilled by Amazon

Arrives Monday, Jun 16
Order within 56 minutes
Available payment plans shown during checkout

Color: Flat Black


Size: Large


Features

  • Shell is constructed with ABS
  • Weight: 1590G ( 50G)
  • Moisture wicking, removable/washable air channeled comfort liner
  • Integrated face shield
  • Padded chin strap with double-d safety lock. Side goggle traction pad keeps goggle strap securely in place

Color: Flat Black


Brand: O'Neal


Vehicle Service Type: street-cruiser-motorcycles, ATV, street-touring-motorcycles, off-road-motorcycles, PWC


Item Weight: 3.5 Pounds


Material: Polycarbonate (PC)


Finish Type: Glossy


Shell Type: Hard


Material Type: Polycarbonate (PC)


Closure Type: Hook & Loop


Sport Type: Motorcycling


Compatible with Vehicle Type: street-cruiser-motorcycles, ATV, street-touring-motorcycles, off-road-motorcycles, PWC


Item Weight: 3.5 Pounds


Shape: Aerodynamic


Color: Flat Black


Global Trade Identification Number: 91


Manufacturer: O'Neal


Brand Name: O'Neal


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Jun 16

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Great helmet
Color: Flat Black Size: X-Large
Love my helmet it works so good and is very comfortable price was great too. Can wear my glasses in it which is great so I can see while I ride.
Reviewed in the United States on May 8, 2024 by Karen

  • Great value and great product
Color: Flat Black Size: X-Large
I don’t have anything bad to say about this helmet. I read some other reviews about sizing. Just make sure that you buy one size bigger than what you normally wear. I followed that advice and the helmet fits great. The helmet fits snug without feeling like the padding is scrunching your face. The helmet is super light weight and it has a sleek design just like the pictures. I saw some reviews where the built in tinted shades were difficult to function. They were not, the slider that brings them over your eyes works great and provides great protection from the sun. Best helmet I’ve ever owned for this value. ... show more
Reviewed in the United States on May 14, 2022 by Stephen

  • Great price except for the chin strap not having a buckle
Color: Flat Black Size: X-Large
Me: I wear glasses, size XL, head size 61cm on the dot, head shape: intermediate oval,modestly toward round but definitely not halfway toward round. Initial, out-of-the-box: It weighed 1606g on my digital scale. Initial fit seems dead-on accurate (mild chipmunk cheeks, mildly tight, not painful but a little annoying--they break in). All liners completely removable. No audio system cut-outs (I'll figure it out). The one thing that absolutely annoys me is that this helmet only has a D-ring chin strap. Come on, you can add a buckle strap for $2 but now I have to go out on retail and spend $10-$15. This obsession with hitting an MSRP of "$159.99" vs "$162.99" has to end. It's like they know this is going to occur. The padding around the chin strap isn't sewn to the strap so that you can adjust it for the buckle that you will eventually buy. I purchased it because it can be converted to a snowmobile helmet with a few part change-outs (breather box, double-lens anti-fog visor). Those parts are from another brand that sells the same helmet for snowmobiling, see "Castle X Mode Dual Sport SV". First ride: Neither visor used, nose vent open. I was just getting a feel for fit & comfort. It was a maintained forest road in Colorado that eventually turned into an unmaintained road with huge fallen trees that you had to divert around in technical slow tight off-the-road both-feet-on-ground over-smaller-fallen-trees try-not-to-stall heavy-breathing off-the-bike-and-get-it-over terrain. Total 3hrs out and back. It's a comfortable helmet for me. I never once though "this thing is uncomfortable." It will fog up you glasses though on the very slow stuff without either visor. It has a horizontal elastic chin cloth that blocks air from coming up from below so all of your breath goes upward. Colorado is a low-humidity place. I'm torn on cutting that out because that is useful in other scenarios. We'll see. My glasses were a little tight and I had to bend them back into shape because I pulled them off my face a little wrong. I never really thought the tightness of the glasses were a real problem though. They didn't hurt and I didn't notice them except for getting the helmet on and off. Second ride: I'm done with this helmet only because I wear glasses. Colorado is low humidity. It was sort of trying to rain this day. I stopped to adjust something. I couldn't see anything within 10 seconds because my glasses fogged up. This is super annoying. I'm going to find a modular helmet (chin moves up) so I can deal with the glasses fogging up. Seems like a nice comfortable helmet. The visors look like they have good non-distortion. I wish it worked because it fits great and parts are available. I didn't ride at any high speed and used neither built-in visor so go find another review for that. I'd keep the thing if it it didn't make me blind if I come to a stop (or slow crawl). ... show more
Reviewed in the United States on August 19, 2022 by WT

  • Trend setting helmet
Color: Flat Black Size: X-Large
Excellent helmet, fit was snug at first yet, needed after some period of break in, it fits great. After regular use it is fitting better. Same with sunshine shield ; as the more I used it the easier it became to bring it down. The helmet keeps the noisey wind out and can hear my music on my ear phones off my IPhone, I get a lot of compliments on the look of the helmet, and I think it is starting a trend; more bikers are wearing these type helmets. It’s tuff, dropped it a few times, minor scratches. Tinted visor after a few uses able to bring it down easy. Clear shield comes in handy on the freeway. Only draw back is the triangle removable chin plate always come loose yet a little black duct tape has solved that issue. ... show more
Reviewed in the United States on May 14, 2021 by Papa Bear

  • Great protection
Color: Flat Black Size: X-Large
Is really ergonomically design. The shades are a plus. Light weight and beautiful craftsmanship.
Reviewed in the United States on September 27, 2023 by Roberto O.

  • Great helmet
Color: Flat Black Size: X-Large
Always wanted an dirt bike helmet and a motorcycle helmet combined.
Reviewed in the United States on January 3, 2024 by Amazon Customer

  • Awesome helmet
Color: Flat Black Size: X-Large
Love this helmet. Comfortable, visor is nice, especially the integrated sun visor on the inside. It’s is well ventilated if moving over 10mph. A bit warm if sitting still. Any wind noise doesn’t bother me, your on a bike, it’s to be expected. Would buy again.
Reviewed in the United States on July 11, 2022 by Amazon Customer

  • Honest uncut review
Color: Flat Black Size: X-Large
IL start by saying it's a nice quality helmet, it's comfortable, I did have to go a size larger and still have a snug fit so deffinitly recommend sizing up. It's very light weight has nice vision and tinted shades are easy to drop. Now the bad- More wind noise than I've ever experienced, it's worse than riding without a helmet to the point where you get a headache after riding longer than an hour. No adjustable air vents- the only adjustment is the mouthpiece which im pretty convinced has little to no impact. It does ventilate nicely. Visor is not removable. Yes you can physically take it off but then your clear windscreen does not properly lock open. The visor catches so much wind your constantly fighting to keep your head straight anything over 40mph. It's gotten to the point where I'm leaning my head forward just to catch a bit of a break. Overall it's not a bad helmet for the price, I'd say if your moreso riding on road then I'd keep looking as it has more disadvantages on road than not. It is a nice crossover helmet and I'd absolutely love it if it had adjustable air vents and a removable visor that still allowed me to use clear glass. Then this would be my favorite helmet. ... show more
Reviewed in the United States on May 23, 2023 by Joe W.

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