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O'Neal

O'Neal Sierra II Mens Full-Face Slingshot Helmet

    • Based on 1,621 reviews
Condition: New
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$143.99 Why this price?
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Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, May 13
Order within 4 hours and 41 minutes
Available payment plans shown during checkout

Size: Large


Color: Black


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

Description

O'NEAL produces motorcycle and cycle gear, parts, apparel and accessories that absolutely offer the best in comfort, quality and protection every time you ride. Security, quality and protection you can trust after nearly 40 years of racing. Features: Shell IIS constructed with ABS - Weight: 1590g ( 50g) - Moisture wicking, removable/washable air channeled comfort liner- Vent holes for optimal ventilation - Integrated face shield- Height adjustable helmet shield - Padded Chin Strap with Double-D safety lock - Meets DOT and ECE 22.05 safety standards - Designed for Street, Enduro, Side by Side and Adventure Bike's- Replacement parts available.


Item Weight ‏ : ‎ 3.51 Pounds


Department ‏ : ‎ Unisex-adult


Date First Available ‏ : ‎ July 1, 2017


Manufacturer ‏ : ‎ O'Neal


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, May 13

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

    • Helmet saved my melon in almost fatal crash
Size: Large Color: Black/White
Review Image by Dave the Menace
Review Image by Dave the Menace
Review Image by Dave the Menace
Review Image by Dave the Menace
Review Image by Dave the Menace
A good helmet for the price that I recommend to buy. It is a little noisy on highway, better remove the visor if you are in warm climate and use the goggle. Large fits perfectly and very comfortable with no stress. No headache or fatigue after 9 hrs ride over the mountains and no issue with breathing but will fog the visor. Don't think twice. Just buy it! I am writing this review because the helmet saved my melon in the accident with 50mph (80kmh). All I had in my mind at last moment was (I am dead) and just squeezed the brakes. I felt my forks bottomed and impact then felt impact on my head. When I woke up "Please take my helmet off. I can't breath" and I was in /out of conscious. Helmet was two weeks old but looks like been through many wars. Two punctured holes and all the marks reminded me of the impact that would easily busted my melon all over the pacement. Got both legs fractured and right wrist as well but survived. I was riding 1996 Yamaha WR200R heading to Lashio (Myanmar) from China. ... show more
Reviewed in the United States on March 18, 2020 by Dave the Menace
    • Lightweight comfortable padding
Size: X-Large Color: Black/White
Review Image by ryan bautista
Review Image by ryan bautista
The media could not be loaded. The helmet it’s self it’s a good product..!! Light weight feels great and Comfortable fits just right I ordered extra large I’m glad I did. I have not taking this out for a ride but I’m sure it should not be a problem!! For this price you can’t beat it looks awesome too.. ... show more
Reviewed in the United States on January 17, 2020 by ryan bautista
    • Good helmet, but I personally didnt love it
Size: Large Color: Black
I got this helmet as I was trying to get into dual sport/adventure riding and didnt want to get something "too expensive" if it turned out not to be the hobby for me. Well, 15,000+ miles later I'm all in, but I've since upgraded to a Bell MX-9 MIPS helmet. I've done the majority of those 15K miles with this O'Neal helmet, and I've worn it in summer, winter, in driving rain, crossed rivers in it, done a few BDR trips with it, etc. and it has performed extremely well and kept me safe. This O'Neal is nice, but has drawbacks. The overall build quality is very good with some caveats. It checks all the boxes for sturdiness and safety, but there are little things here and there that werent as polished as they could be. The tabs on the padding dont really sit flush with the helmet lines, especially after you remove the padding to wash it the first time. It doesnt have a very good means to install a comm system like a SENA or Cardo. Not only does the helmet NOT have cut outs for speakers, but there isnt a very good place on the outside of the helmet to mount a SENA or Cardo unit. It was a real pain trying to find a spot on the helmet where my Sena 20s would fit because of the sharp angles and contours of the helmet around the sides and bottom portion. I did manage to install my SENA, but no cut outs for the speakers did diminish the felt comfort of the helmet, but not painful by any means. The helmet is also BIG. Surprisingly big, to the point that I look more like an astronaut than a rider. I have a smaller stature so that doesnt help the perception, but this helmet makes my head look 3 times bigger than it is, even though the helmet fits properly. The contours are nice and aerodynamic, which I'll touch on more below, but it still has a very large profile and the very angular, pointy contours and appearance make it seem a little "extra". The styling is less in line with the contemporary, streamlined ADV look you get with Bell, Arai, or Klim. The helmet style, with its sharp angles and points, makes me feel like I should get a Metal Mulisha t-shirt and a tattoo sleeve which doesnt really fit the "style" you see with a lot of ADV stuff right now. This is a pretty subjective point though and up to your own taste, I prefer the sleek look of a Bell or Arai personally, but for the price and safety features this helmet was my initial choice and its done the job very well. The wind guard that installs around your chin is garbage. I see there's a photo posted here by another buyer that highlights the same problem: the wind guard simply doesnt attach. There are hooked tabs on the wind guard, and there are slots in the helmet for it to "snap" in, problem is, they didnt finish the job. The wind guard doesnt really "snap" into the helmet like it should and the result is its sits in the helmet very well...until you get on your bike and ride away, at which point the vibrational, windy nature of riding a motorcycle makes it fall out of your helmet. I ultimately used some black gorilla tape to tape the wind guard into place. Now it stays put but, I shouldnt have to do that with a name brand like O'Neal.... The other gripe I have with this helmet...its HEAVY. Very heavy, unusually heavy given what its made out of and the amount of padding it lacks vs other helmets. This helmet has styrofoam, then padding. My Bell MX-9 MIPS has styrofoam, the MIPS liner, a mesh liner/sweat guard, then padding, and it weighs only 3lbs. My girlfriends LS2 helmts have styrofoam, mesh liner/sweat guard, and paddding, and it weighs 3.5lbs. This helmet has styrofoam, and then padding. This helmet does not weigh 3.5 lbs, mine weighs around 4.5 lbs BEFORE I attach my Sena and GoPro. I ride all day, even during winter I will typically ride 7-10 hours on a Saturday, and after I get halfway through my day I can definitely feel this helmet's weight in my neck. Its not uncomfortable or painful, but I know its there. Pro's about this helmet are its a great entry level adventure helmet. Its a name brand, DOT and ECE rated helmet for less than $150, thats awesome! The peaked visor is really good, its a larger visor than many other brands and blocks the sun and debris much more effectively, I wish my Bell MX-9's visor had the coverage this one has. The helmet is also very quiet, almost as quiet as my old Shoei. My Bell and GF's LS2's by comparison are a lot louder. I didnt feel the need to wear earplugs with this helmet, I do with my Bell. Part of the reason for it being quiet is also the design: for a peaked helmet that's budget oriented, its extremely aerodynamic. This has to do with the helmet styling, all the weird angles, points, and lines make this helmet very aerodynamic, which helps make it quiet. The amount of canards, vents, angles, and other design aspects make the airflow around the helmet excellent. My Bell is aerodynamic because its small and compact, this helmet is aerodynamic because of its style and external features. On the highway, it actually feels lighter going 70mph because the canards and angles help with airflow. Even though the visor is huge, its shape allows it to cut through the air very well and I've never had an issue with wind catching the visor ans snapping my head around. The aerodynamics of this helmet are really, really good. Its also a little bit warmer in cold weather than other helmets I've used, which is also a plus. However, after almost a year, this helmet started to feel "loose". Maybe I really need a medium, but my head size is fit for a Large. it fit snug when I first received it, but never too snug. Now after a year and lots of riding, it feels a little too loose for comfort and shifts around a little too easily. Its still a great helmet and I will keep it around as a back up. If you have a big head and dont mind some of the caveats above, its a good choice for the features you get at this price range. Mine has taken a beating and hasnt given up yet. ... show more
Reviewed in the United States on January 21, 2021 by bajaX
    • Something is radically wrong with their sizing (hint: two sizes smaller than marked).
Size: XX-Large Color: White
The helmet looks and feels great in my hands, the only problem is that I almost couldn't squeeze my head into the size that supposedly should fit well. My head size is 62.5 cm, maybe 63 max, not round and not too long, and XXL is rated for 63-64 cm - but, omg, what a torture it was, even if for 5 minutes! Extremely hard to pull on, incredibly tight all around, particularly bad on cheeks - yes, my face is relatively wide, too, but those points were absolutely intolerable, nothing that could settle over time, unless my head would shrink under that pressure. Pulling it off felt like risking to pull off my head with it. I wish there was size 2XXL to try, but no luck. Either something is terminally wrong with their sizing, or this particular helmet was mismarked, as my car racing helmets are size XXL, HJC would even fit in a pinch in size XL. Returning, to my highest disappointment. ... show more
Reviewed in the United States on November 17, 2020 by Vladimir Vinokurov
    • Perfect offroading helmet if you wear eyeglasses.
Size: Medium Color: Black/White
I was super stoked when I got this helmet and started examining it. I had just returned a Bell MX9 helmet 2 days earlier due to it not fitting, i.e. not allowing the use of eyeglasses/sunglasses. I dont like wearing goggles and find them stuffy and clunky. Much prefer the use of a shield. So to find a offroading helmet that has a shield and accommodates glasses is a challenge, at least until now. The sectioning of the temple foam sits about an inch lower inside as compared to Bell helmets so this is absolutely perfect for allowing eyeglass stems to slide into the helmet. The sizing of this Oneal has been spot on just like my other two Oneal helmets (different models). The fit and finish are also very high quality and comparable to helmets of a higher price point. The other perk to this helmet is that the Oneal shell sizing is slimmer than Bell's and I dont end up looking like a bobble head. Truely the only thing that would make me more happy is if Oneal offered some of the wild paint schemes in this model like the Afterburner or Warhawk. I even have the classic Monster graphic on an older Oneal that I cannot bear to part with. I love em! ... show more
Reviewed in the United States on August 16, 2019 by Pdubja

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