In this article I’m going to give you a list of the best half shell mountain bike helmets.
Half shell mountain bike helmets, otherwise known as open face helmets, are meant for both trail and enduro riding. Professional riders prefer road bike helmets for cross country, but obviously what you decide to wear is all up to you.
The reason these helmets are on this list is because of their Virginia Tech rating, which ranges from good, to excellent, to best-in-class. What is clear is that crash technology does add to the overall safety of the helmet. So it’s more than just marketing and sales mumbo-jumbo.
Things like Multi-directional Impact Protection or MIPS, polycarbonate shell reinforcement, and multi-density EPS liners all work in favor of the helmet maintaining its structural integrity and absorbing and dissipating impact energy.
Of course there are other things that are maybe just as important, like comfort, fit, and sweat absorption, since no rider is actively pursuing a crash test of their helmet, but is looking for quality with these other characteristics.
Let’s take a look at what made it on my list of the best half shell mountain bike helmets.
Fox Racing Dropframe Pro
The design of the Fox Racing Dropframe Pro is certainly unique, and a hit-or-miss design-wise depending on the person you speak to.
Design arguments aside, what you can’t deny is the added amount of crash protection you get with this helmet, there’s simply more of it.
The shell is made from a mix of thermoplastic, polycarbonate, and polyamide instead of your regular polycarbonate. The liner is a dual-density EPS for added energy absorption versus a regular EPS liner.
The helmet wraps around the ears, providing more coverage without getting in the way of your field of vision. And it also comes with the MIPS crash technology, something almost every high-end helmet currently has.
At 460 grams it’s about a hundred grams heavier than your standard open face mountain bike helmet, but that added weight is something you won’t notice while riding.
One thing to keep in mind is that the visor is fixed into place, which might impair your vision on very steep descends.
Because the helmet covers a much greater area, Fox decided to ditch the adjustment wheel normally used to create the desired fit. Instead Fox achieves a comfortable fit by providing a padding fit kit with two different sets of padding. Together with the Fidlock buckle it does a great job in keeping the helmet in place.
In terms of heat management, more coverage also means more heat buildup. If you’re using this helmet for a lot of ascending, it’s noticeably warmer. On the other hand, slow climbing is not really the intended use of this helmet.
The Fox Racing Dropframe Pro is a perfect choice for those who’re seeking for more protection, without wanting to ride with a full face helmet. And it fulfills this role outstandingly, offering better crash protection than any other standard open face mountain bike helmet.
- Offering more protection over your standard open face helmet, without neeing to go for a full face one.
- The design, the fixed visor, heat buildup
Fox Racing Mainframe Trvrs
The Fox Racing Mainframe Trvrs is one of the more affordable half shell mountain bike helmets with a decent Virginia Tech rating.
Crash technology does help improve both the strength of a helmet as well as its means of absorbing and redirecting impact energy. The only thing is that on average you have to pay twice the amount of money you have to pay for this helmet if you want the latest and greatest.
So what you get for a sub-100 USD price is a great-looking helmet with MIPS technology, a polyamide shell instead of polycarbonate, a fixed visor, and that’s about it. It means this helmet covers the basics for a decent price, and is a great option to obtain MIPS technology at an entry-level price.
- You want a well designed MIPS helmet on a budget.
Fox Racing Speedframe Pro
The Fox Racing Speedframe is the same helmet as the Pro version in everything but a small number of features.
The Speedframe Pro is one of the best helmets in terms of safety, and the standard Speedframe inherits many of its safety features except for the multi-density EPS liner.
The helmet is known for having an excellent fit, and you can fit a pair of goggles underneath the 3-point adjustable visor, as well as stash your glasses.
A good fit without pressure points, and a huge number strategically placed vents funneling air into and over your scalp keeps the heat buildup at bay. The air flow is especially noticeable when you pick up speed.
To keep the price down when compared to the Pro version, there’s a cheaper liner and the Fidlock snap buckle is missing from the straps, in an otherwise similar 360 degrees fit system.
It’s a great-looking mountain bike helmet, available in many colors and 3 sizes to choose from.
- One of the safest mountain bike helmets, in lots of different color variations.
- None
Giro Manifest Spherical
The Giro Manifest Spherical offers the airiness of a road bike helmet in an open face mountain bike helmet package.
The general notion of this helmet is that Giro played around with the design of the helmet to ensure maximum air flow. With 19 air vents it seems to do the trick creating probably the best mountain bike helmet for hot summer rides.
In terms of protection it offers the same as the already very expensive Giro Merit Spherical, but tops it off with an added ring of polycarbonate called the Auro Arch, which serves as a kind of roll-cage for your head.
So it means you also get the MIPS Air technology, the Spherical ball-and-socket setup for the EPS liner, which has a dual-density characteristic.
The Manifest is not only one of the safest helmets on the market, it’s also one of the best-ventilated. A total of 19 huge vents in a relative low-weight package ensure maximum air flow and a reduced risk of heat building up. When you don’t do prolonged stretches of slow climbing the chances of the helmet feeling hot and uncomfortable is near zero.
Does that kind of tech win awards in the safety department? Yes it does. Does that kind of tech win awards in how fast it’ll drain your wallet? It does that equally impressive, being the most expensive helmet of its specific category.
- Jam-packed with award-winning crash technology to create the ultimate mountain bike helmet for hot summer trail riding.
- Extremely expensive
Giro Merit Spherical
The Giro Merit Spherical offers superb crash protection in a fantastic open face mountain bike helmet.
There are multiple crash technologies ensuring this helmet sits at the top of the range in terms of protecting. As do many other helmets it offers MIPS technology. The Merit uses MIPS Air which is the lightest variant.
Furthermore it offers Spherical technology, commonly referred to as a ball-and-socket setup where the inside of the helmet can move independent from its outer shell. A dual-density EPS liner is the last piece of tech to ensure maximum crash protection.
The entire package is still very light at 360 grams. Other great features are the bolt-on adjustable visor and the multi-point Roc Loc adjustment system.
The only downside I can think of is that you have to pay a lot of money for all that tech.
- One of the best open face mountain bike helmets, period.
- Very expensive
Giro Tyrant Spherical
The Giro Tyrant Spherical is Giro’s single offering of a mountain bike helmet with ear protection. The brand consistently scores high rates in crash tests and this helmet is no exception.
Besides the now standard MIPS technology, it has a reinforced polycarbonate to keep the helmet structural integrity intact in case of an impact. The helmet also features dual-density EPS foam, to increase the energy absorption characteristics.
Its shape also means that besides added coverage you get added weight. The 600 grams of this helmet means it’s the heaviest open-faced helmet I know.
In terms of design the helmet obviously distinguishes itself from your average half shell mountain bike helmet. It also has a much cleaner look, especially when you go for an all black one.
Since the helmet covers a larger area of your head it’s meant for those either seeking added protection over your standard half shell, or more ventilated version of a full-face helmet.
- The go-to compromise when you don't want to go for a full-face helmet.
- It's both heavier and warmer than a standard half-shell. The Fox Racing Dropframe has a better rating
Giro Women's Merit Spherical
The Giro Women’s Merit Spherical is, as the name implies, exactly the same as the standard Merit, yet offers a range of colors Giro calls the “women’s series”.
As they state themselves on the sales page, there’s no anatomical difference between women and men’s heads.
- Offers the exact same outstanding features of the Merit Spherical.
- Very expensive
POC Tectal Race SPIN
The POC Tectal Race SPIN is a fantastic-looking half shell mountain bike helmet featuring the SPIN crash technology.
SPIN is POC’s proprietary crash technology and is an abbreviation of “Shearing Pad INside”. Its goal is the same as MIPS, with rotational forces being dissipated by using silicone bladders in the liner.
The SPIN technology in combination with the unibody EPS structure, and aramid puncture-resistant reinforcement makes for an excellent impact-resistant helmet.
I believe that because of its proprietary nature POC decided to ditch SPIN in favor of MIPS in their recent lineup, for what is probably a marketing and sales reason. Because SPIN proved to be an excellent approach to increase a rider’s safety with respect to the helmet.
It is what it is, and it does mean that excellent can probably be had for less than its initial suggested retail price of 230 euros.
- Just as good as the MIPS version and probably cheaper
- If you're serious about getting a MIPS helmet
Troy Lee Designs A1
The Troy Lee Designs A1 takes everything from its more premium brother the A2, but is offered with a standard EPS liner instead.
Furthermore it comes with a regular padding not the X-Static one.
This shaves a couple of dollars from the price, which means you still get a great-fitting, comfortable helmet that excels in the area it should excel in, which is safety and crash protection.
- If the A2 is a bit too much for your budget
- The A2 is better
Troy Lee Designs A2
The Troy Lee Designs A2 is one of the most affordable, high quality, open-faced mountain bike helmets worth your money.
It offers superb comfort and fit, with an anti-bacterial X-Static Pure Silver padding. The padding sits within a dual-density EPS liner. The polycarbonate shell wraps around the edges to further protect the rather delicate EPS.
The decade-old design has been updated to feature the MIPS technology. Safety is further enhanced with the bolt-on breakaway visor, and 3-point fit system.
Part of the popularity of the A2 can be attributed to the comfort it provides. Both with the excellent fit and its ability to keep your head cool when you try and get the most out of your ride. 2 vents on the side extend far into the front. Together with elongated vents on top they suck in cool air, which can exit through a number of vents located at the back.
It’s a great looking helmet, available in many colors, with a perfect track record in crash protection, for a price below many of the top-of-the-line offerings from its competitors. An unbeatable proposition when it comes to mountain bike helmets.
- Best-in-class safety for a reasonable price when compared to the competition
- None
Specifications half shell mountain bike helmets
Name | Price | Technology | Shell | Liner | Visor | Fit | weight (gr) | eyewear port | rating | Buy at Amazon |
|---|---|---|---|---|---|---|---|---|---|---|
Fox Racing Dropframe Pro | 200 USD | MIPS | thermoplastic polycarbonate polyamide | dual density EPS | integrated | custom padding w. Fidlock buckle | 460 | 8.85 | ||
Giro Merit Spherical | 220 USD | MIPS Air/Spherical/Hardbody | polycarbonate | dual density EPS | bolt-on adjustable | Roc Loc 5 Air | 360 | yes | 9.90 | |
Giro Women’s Merit Spherical | 220 USD | MIPS Air/Spherical/Hardbody | polycarbonate | dual density EPS | bolt-on adjustable | Roc Loc 5 Air | 360 | yes | 9.90 | |
Troy Lee Designs A2 | 170 USD | MIPS | polycarbonate | dual density EPS | bolt-on breakaway | 3-point dial fit | 350 | yes | 9.99 | |
Fox Racing Speedframe Pro | 190 USD | MIPS | polycarbonate | dual density EPS | 3-position adjustable | 360° Fit System w. Fidlock buckle | 380 | yes | 10.84 | |
Giro Tyrant Spherical | 160 USD | MIPS/Spherical/Hardbody | polycarbonate | dual density EPS | bolt-on adjustable | Roc Loc 5 Air | 600 | yes | 11.22 | |
Troy Lee Designs A1 | 145 USD | MIPS | polycarbonate | EPS | bolt-on breakaway | 3-point dial fit | 393 | yes | 11.65 | |
POC Tectal Race SPIN | 230 EUR | SPIN/Aramid bridge/Unibody | polycarbonate | EPS | adjustable | 368 | 11.67 | |||
Giro Manifest Spherical | 260 USD | MIPS/Spherical/Hardbody/Aura Arch | polycarbonate | dual density EPS | bolt-on adjustable | Roc Loc 5 Trail w. Fidlock buckle | 340 | yes | 12.20 | |
Fox Racing Mainframe Trvrs | 90 USD | MIPS | nylon polyamide polycarbonate | EPS | integrated | 390 | 13.37 |
Johan van Seijen
FoundeR Restoration.bike
Johan van Seijen is the founder of restoration.bike. His passion for cycling in general, and restoring older bikes turned into a website to share his knowledge with a broader audience. Starting out on his father’s road bike and riding classics as the Amstel Gold Race and Liege Bastogne Liege he has shifted his attention to trail, XC, and gravel riding since. No matter how much he loves writing about everything related to cycling, nothing beats actually using his ever-expanding bicycle collection.
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