When a helmet platform is already successful, redesigning it presents an unusual challenge.
Change too little and there's no reason for drivers to upgrade. Change too much and you risk losing the characteristics that made the original successful in the first place.
For the Stilo ST6 FN ABP 8859-2024 Carbon Fiber Helmet, Stilo took a different route: start with the proven ST5 platform and methodically improve the areas drivers interact with most.
The result is measurable. Compared with the ST5, the new ST6 delivers 10% lower weight, 26% greater airflow, and 11% more visibility, along with revised aerodynamics, additional shell sizes, improved interior comfort, and an entirely redesigned visor system.
Then there's the most important part: FIA 8859-2024 ABP homologation and Snell SA2025 certification, bringing the helmet into the newest generation of motorsport safety standards.
This isn't simply an ST5 with a new shell. The ST6 represents more than 25 years of Stilo helmet development condensed into a new platform.
Start With the Shell: Why Puro Technology Matters
Carbon fiber helmets aren't automatically lightweight simply because they're made from carbon.
The manufacturing process—and everything added to the shell afterward—matters.
Stilo uses its Puro Technology manufacturing approach to minimize unnecessary coatings and finishing materials around the carbon structure. Rather than adding weight for cosmetic purposes, the philosophy is to retain the material properties drivers actually want from carbon fiber: rigidity, strength, and low mass.
Stilo takes that weight-saving philosophy a step further with the ST6 by expanding its shell sizing.
ST6 Zero and ABP helmets are now produced across four shell sizes, allowing Stilo to more closely match the physical shell to the driver's head size.
Why does that matter?
A smaller driver shouldn't need to wear an unnecessarily large shell packed with additional interior material simply to achieve the correct fit. More shell sizes allow the helmet to remain closer to the dimensions required for each driver, contributing to both lower weight and a more proportional fit.
On track, less helmet mass means less weight for the driver's neck to manage through braking zones, high-speed direction changes, bumps, and sustained lateral loads.
26% More Airflow Isn't a Small Change
Helmet ventilation tends to sound insignificant until you're sitting on grid in July.
Stilo substantially reworked airflow through the ST6, producing a claimed 26% increase compared with the ST5.
The changes begin at the front of the helmet with redesigned intake geometry and continue through new upper vents. Air is directed through internal EPS channels, helping move heat and moisture away from the driver's head.
This isn't simply about making the helmet feel cooler.
During a demanding stint, heat and sweat become distractions. Improved ventilation helps create a more manageable environment inside the helmet so the driver can concentrate on the car rather than what's happening underneath the visor.
That advantage becomes particularly relevant in the FN configuration, which uses an open-ear design intended to maximize awareness and cooling.
Stilo Found 11% More Visibility
The ST6 also addresses something every driver uses during every second on track: the eyeport.
Stilo increased visibility by 11% compared with the ST5, with particular attention paid to downward vision.
Looking farther downward might not sound particularly important until you consider everything positioned below a driver's normal sightline.
Harness buckles. Steering wheel controls. Digital dashboards. Switch panels. Brake bias controls.
Improving that viewing angle can reduce the amount of head movement required to interact with equipment inside the cockpit. The wider opening can also make seemingly mundane tasks—like fastening belts before a session—noticeably easier.
It's a good example of the ST6 development philosophy: not every improvement needs to be dramatic to make the driver's experience better.
ABP Adds Another Level of Frontal Protection
The ABP designation is one of the most important differences between this helmet and a conventional ST6 FN.
ABP stands for Advanced Ballistic Protection and refers to additional frontal protection incorporated to meet FIA requirements.
This is particularly relevant to the types of environments the FN helmet is designed around. Formula, prototype, and other open-cockpit cars can expose drivers to hazards that simply aren't encountered in the same way inside a fully enclosed cockpit.
The ST6 FN ABP combines that additional frontal protection with FIA 8859-2024 ABP homologation, positioning it as an option for drivers who want the specialized ABP configuration without moving into Stilo's FIA 8860 helmet category.
Snell SA2025 Moves the Standard Forward
The other major certification attached to this ST6 is Snell SA2025.
SA2025 is an evolutionary update to the previous SA2020 standard rather than a complete reinvention. The new requirements increase linear impact performance expectations, including slightly higher impact velocities and lower permitted peak G-force thresholds across the tested head-form sizes.
The updated Snell requirements also move into closer alignment with the new FIA 8859-2024 standard.
For racers shopping for new equipment now, that matters.
A helmet is typically an investment used across multiple seasons. Choosing a current-generation SA2025 helmet provides a newer certification baseline for drivers preparing their equipment for the coming years of competition.
The Visor Received Its Own Redesign
Stilo didn't carry the ST5 visor forward unchanged.
The ST6 moves to an injection-molded visor designed to provide improved optical clarity and durability. It also incorporates a high-performance anti-fog treatment that can be washed, making routine maintenance more practical over the life of the shield.
The hardware surrounding it has changed as well.
A new dual-lock system allows the visor to meet FIA requirements in both fully closed and vented positions, while revised hardware provides smoother operation and easier installation.
These are exactly the kinds of changes that can disappear on a specification sheet but become obvious after a season of actually using the helmet.
One important consideration for existing Stilo owners is compatibility: ST5 shields do not fit the ST6. The new platform requires ST6-specific ABP shields and corresponding hardware.
The Interior Wasn't Left Behind
Shell technology attracts attention, but the part of the helmet the driver actually feels is the interior.
Stilo redesigned the liner and cheek pads for the ST6 with an emphasis on comfort and stability. Reshaped cheek pads help maintain the helmet's position at speed while creating a more comfortable interface around the driver's face.
Combined with the additional shell sizes, this allows Stilo to approach fit from both directions: selecting a more appropriately sized exterior shell and refining how the interior supports the driver's head.
Proper sizing remains essential. Drivers should measure around the widest portion of the head, roughly one inch above the eyebrows, take the measurement several times, and use the largest consistent result when referencing Stilo's sizing chart.
Why Choose FN Instead of ST6 GT?
The ST6 FN and ST6 GT are designed around different cockpit environments.
The ST6 GT incorporates side ports that support equipment commonly used in closed-cockpit cars, including forced-air cooling, communications, and hydration systems.
The ST6 FN eliminates those side ports, creating a cleaner exterior profile better suited to formula, sprint, and open-wheel applications.
Removing the GT-style side integrations also gives the FN an aerodynamic advantage for the environment it was designed to operate in.
Neither configuration is universally "better." The correct choice depends on the car and the equipment the driver needs.
ST5 to ST6: Is It Actually a Meaningful Change?
Looking at the improvements together answers that question better than any single feature.
10% lighter.
26% more airflow.
11% greater visibility.
Four shell sizes for Zero and ABP models.
New injection-molded visor technology.
Improved visor hardware.
Revised liner and cheek pads.
FIA 8859-2024 ABP homologation.
Snell SA2025 certification.
The ST6 doesn't abandon what worked about its predecessor. Instead, Stilo has gone through the helmet system by system—shell, airflow, eyeport, visor, interior, aerodynamics, and protection—and looked for places to improve it.
A New Chapter for the Stilo Formula Helmet
The Stilo ST6 FN ABP 8859-2024 Carbon Fiber Helmet SA2025 is ultimately a product of refinement.
Its biggest advances aren't gimmicks or styling exercises. They're changes a driver can actually benefit from: less weight to carry, more air moving through the helmet, a larger field of vision, improved fit, more durable visor construction, and current-generation impact protection.
For formula and open-cockpit drivers considering an upgrade from an ST5—or purchasing a premium carbon helmet for the first time—the ST6 FN ABP provides a clear look at where Stilo believes modern helmet technology is headed.
Lighter where weight matters. More open where the driver needs visibility. Better ventilated where heat builds. And more advanced where protection matters most.
That's the kind of evolution worth paying attention to.
