Search  for anything...
O'Neal

O'Neal Sierra II Mens Full-Face Slingshot Helmet

    • Based on 1,966 reviews
Condition: New
Checking for product changes
$143.99 Why this price?

Buy Now, Pay Later

As low as $24.00 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

This item is eligible for return within 30 days of receipt

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by MxMegastore
Arrives Friday, May 24
Order within 8 hours and 31 minutes
Available payment plans shown during checkout

Recently Viewed

Size: XX-Large


Color: White


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.


Color: White


Brand: O'Neal


Vehicle Service Type: street-sport-motorcycles, street-cruiser-motorcycles, street-motor-scooters, marine-personal-craft, snowmobiles, utility-vehicles, all-terrain-vehicles, street-touring-motorcycles, off-road-motorcycles See more


Item Weight: 3.5 Pounds


Material: Acrylonitrile Butadiene Styrene


Item Weight ‏ : ‎ 3.51 Pounds


Department ‏ : ‎ mens


Date First Available ‏ : ‎ August 30, 2018


Manufacturer ‏ : ‎ O'Neal


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, May 24

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • PayTomorrow Financing
  • Apple Pay Later
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • 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
    • = Description
Size: Medium Color: White
Same as description. Too bad it doesn't have pinlock
Reviewed in the United States 🇺🇸 on April 30, 2023 by Engels F.
    • Fits my big head
Size: XX-Large Color: Black
I was a lil worried because sometimes it's hard to find something that fits. But it is perfect.
Reviewed in the United States 🇺🇸 on April 19, 2023 by S
    • Quality
Size: XX-Large Color: Black
It fits well, the face mask is of quality material and feels solid and the sun visor is cool
Reviewed in the United States 🇺🇸 on April 12, 2023 by scott bosworth
    • Sizing Chart Suspect
Size: XX-Large Color: White
Helmet is a great buy but beware of the sizing chart, I measured 24 inches which according to the sizing chart is an XL. Reading other reviews that stated they run small I ordered an XXL and it was STILL on the tight side. Hoping after break-in it'll be better.
Reviewed in the United States 🇺🇸 on February 13, 2023 by Robert Duke
    • Well Made Helmet
Size: Medium Color: Black
Fits great. I was able to attach my SENCO headset!
Reviewed in the United States 🇺🇸 on March 24, 2023 by ❤️GermanShepherds
    • Not a bad helmet.
Size: XX-Large Color: Black
The inner dark lens is a little hard to find the lever when riding and when it Comes down it will hit my nose. These helmets aren't true to size. Definitely go bigger
Reviewed in the United States 🇺🇸 on January 11, 2023 by Amazon Customer
    • Great dual visor helmet for the money
Size: Medium Color: White
Great helmet for riding my Africa Twin. Only complaint is the d ring strap. I would rather have a quick release.
Reviewed in the United States 🇺🇸 on January 9, 2023 by Calvin B.

Can't find a product?

Find it on Amazon first, then paste the link below.