If you're looking for retro style, and don't care about having anything in front of your air flowing freely, then the kuaifly German style half helmet is an honest representation of what's been popular among motorcyclists riding city streets for fifty years.
At approximately 700 grams (that's light enough for you to forget you have it on), it's a classic half shell that provides a stylish and airy experience. However, as with any half shell, you sacrifice coverage to maximize airflow. Therefore, it cannot be used for protective purposes.
You can purchase the kuaifly here.
Specifications and Build Quality
Kuaifly says the ABS shell inside of this helmet is "lightweight" according to the specifications sheet. In fact, it weighs approximately 700 grams. that is significantly lighter than most full-face helmets, which weigh in excess of 1400 grams.
Inside of the helmet resides a thick layer of high density vented EPS. As such, the foam can absorb impact energy. Ventilation is also provided through the entire helmet, allowing for breathability. There is essentially no material obstructing airflow in front of your face.
The chin strap quickly releases using a plastic click-type buckle. Many riders enjoy being able to rapidly release their chin straps, especially when stopping frequently or engaging in other activities requiring them to remove their helmet. The chin strap also features a relatively thin band along the underside of the chin, which may be less padded than a two-point harness. Nevertheless, for casual riders, it should provide sufficient protection.
Sizes available are M, L and XL with corresponding head circumference ranges:
-
M (21.6 - 22 inches)
-
L (22.4 - 22.8 inches)
-
XL (23.2 - 23.6 inches)
Kuaifly says the M size will fit a 21.6-inch to 22-inch head measurement. While these measurements seem close together, the difference could potentially mean that someone measuring 22 inches flat to the bone may be too big for the M size. If your head measures 22 inches flat to the bone, try stepping up to the larger size instead of trying to squeeze in.
This is a common trend with helmets manufactured overseas by Asian companies, particularly those that provide sizing based upon head circumference vs. European-based sizing that offers more leniency. The finish on the helmet is smooth, and the paint job appears durable after numerous months of daily commutes. You are not purchasing a product made from aerospace-grade composites or carbon fiber. Accordingly, the build quality will directly correlate with where you fall on the pricing spectrum.
Safety: What DOT Certification Means on a Half Helmet
As indicated on the packaging of the helmet, DOT certification indicates compliance with FMVSS No. 218 standards for motorcycle helmets sold in the United States. These standards dictate minimum requirements for helmet impact attenuation and structural integrity (shell retention).
DOT certification does NOT indicate that an independent third party performed a crash test on the helmet. DOT certification is merely an indication that the manufacturer has tested the helmet to meet basic standards outlined in FMVSS No. 218.
One major limitation of DOT certification is that it does not address chin or facial protection afforded by a helmet. By definition, a half-shell helmet does not offer equivalent levels of protection as a full-face helmet.
In fact, NHTSA clearly articulates how important full-face coverage is in preventing serious injury in cases where riders are involved in accidents.
If you ride primarily on highways, or engage in aggressive riding, the trade-offs associated with wearing a half shell become far less appealing. Instead, consider a helmet designed specifically for urban commute-style riding, where wind and sun exposure pose the greatest risks.
To learn more regarding safety ratings for helmets, please visit the NHTSA guide to motorcycle helmet safety.
Fit and Sizing
The kuaifly is fitted like a hat that hugs the top and rear portion of your cranium. Padding is located at the top and rear portions of the skull area, however, there is no padding at the jaw line or cheek bones therefore you rely on your head shape to maintain center positioning.
Narrower faced riders tend to experience better stability with this helmet model.
There is virtually no room for adjustment if you measure your head within the specified range for M (21.6 to 22 inches). If you measure your head at 22 inches flat with a soft tape measure, you will likely find the M size pressing against your temples. You may want to consider jumping up to L size instead, although L size begins at 22.4-inches , which isn’t always feasible.
The buckle on the chin strap operates properly for casual riding but doesn’t operate as securely as traditional D-rings. You can easily unclip it with forceful push of your chin if you drop your head wrong on a bump. That’s just a real world consequence of owning a half helmet.
Since there aren’t any cheek pads or neck rolls, you’ll probably find that the helmet shifts more during aggressive cornering. Adding some additional padding to the chin strap and/or increasing the width of the attachment point may alleviate this problem somewhat, but both options would increase weight , which is precisely why you purchased this helmet for its low weight.
What Other Amazon Customers Are Saying About the Kuaifly
Amazon currently lists the kuaifly with a 4.3 star rating across 325 customer reviews , a respectable number for a helmet priced similarly to this one. Multiple customers mentioned how much they love the retro look and feel of this helmet model. Additionally, multiple reviewers praised how lightweight this helmet is and that they often forget it was even on their head during short rides.
Customer reviews were generally positive toward this product. however, opinions vary depending upon individual needs and preferences. Customers with average sized heads typically reported that the M size fits snugly on their head. whereas customers reporting larger-sized heads said they had to go up a size due to how tightly fitting the smaller sizes were.
Several customers commented negatively about the quick release buckle not operating as securely as traditional D-rings. Some reviewers noted that the helmet tends to sit higher on their head than anticipated. thus causing some instability at speeds greater than 35mph or in windy conditions. Again , these are typical limitations inherent with half-shells. none of these issues came as a surprise to us either.
Many reviewers complimented the ventilation provided by this helmet model. describing it as ideal for warmer weather riding due to complete openness of the front section of the helmet , eliminating any possibility of fogging-up.
Additionally, we wanted to note that this particular half shell model would require separately purchased eye-wear for wind/breeze/sun protection as there is no built-in visor.
Who is this helmet Designed For
This particular helmet is perfect for individuals who prioritize style and air-flow over protective qualities. Scooter enthusiasts, vintage cruiser aficionados and commuters who regularly travel distances < 25 mph on local roads would benefit from this product.
Do not purchase this product if you prioritize protection and weather-resistant capabilities , half shells do not protect your teeth, nose or jawbone in case of forward momentum impacts.
Compare specs side by side in the comparison table.
More buying guides live on the blog.
Frequently Asked Questions
Short answers to what buyers usually ask about this helmet.
Is a half helmet DOT certified protection enough?
DOT certification means the shell and liner passed FMVSS 218 impact testing. It does not mean full-face coverage. Your chin and face stay exposed, and that is the trade you accept for the airflow and weight.
How do I pick my size?
Measure your head circumference and match it to the chart. M fits about 21.6 to 22 inches, L fits 22.4 to 22.8, and XL fits 23.2 to 23.6. Buyers with in-between measurements tend to size up.
Will it work with sunglasses?
Yes. The open face design leaves room for most glasses, and there is no visor to conflict with them. Buy riding glasses for wind protection since none is built in.
Is the quick release strap secure?
It is DOT-compliant and holds under load. Some buyers prefer traditional D-rings for peace of mind, but a quick release is standard on most modern helmets and passes the same standard.
Can I ride at highway speeds with it?
Legally yes in most states, but be honest about the trade. Wind noise rises, the shell lifts at speed, and exposed skin takes the full blast. It is happiest on city streets and cruisers at moderate pace.
How heavy is it really?
About 700 grams, which is light enough that neck fatigue is a non-issue on long rides. That low weight is the main reason riders put up with the coverage tradeoff.