Helmet Materials Guide: ABS, Polycarbonate, Fiberglass and Carbon Fiber Explained

Helmet materials can be confusing when you are comparing products online. One helmet may use ABS plastic, another may be described as polycarbonate, while higher-priced motorcycle helmets often mention fiberglass, composite shells, or carbon fiber.

The material name can tell you something about how a helmet is constructed, but it should not be used as the only way to judge a helmet. Shell material, impact liner, design, fit, certification, helmet weight, manufacturing quality, and intended use all work together.

This helmet materials guide explains the most common helmet shell materials, how they differ, and what buyers should consider before deciding which material suits their riding and budget.

If you are still deciding which helmet to buy, start with our complete helmet buying guide. Motorcycle riders can also read our motorcycle helmet buying guide, while cyclists can use our bicycle helmet buying guide.

What Are Helmets Made Of?

A helmet is not made from only one material. Most helmets contain several layers and components that serve different purposes.

Depending on the helmet design, these can include:

• An outer shell
• An impact-management liner
• Comfort padding
• A retention or strap system
• Ventilation components
• A visor or face shield on compatible motorcycle helmets

When people talk about helmet materials, they are usually referring to the outer shell. However, the shell is only one part of the complete helmet system.

What Does the Outer Helmet Shell Do?

The outer shell forms the visible exterior of many helmets. Its exact role depends on the design and type of helmet.

The shell can help distribute forces across a broader area, protect internal materials from normal wear, provide a mounting surface for components, and form the helmet's overall shape.

However, you should not assume that a thicker-looking shell is automatically better or that one material name guarantees a particular level of protection.

Check whether the exact helmet meets the applicable standard for your activity and market. Our helmet safety standards guide explains CPSC, DOT, ECE and Snell information in more detail.

What Is the Helmet Impact Liner?

Under the outer shell, many helmets use an impact-management liner made from energy-absorbing material. Expanded polystyrene, often called EPS, is commonly used in many bicycle and motorcycle helmets.

The liner is designed as part of the helmet's impact-management system. Depending on the design, it may deform or crush when managing impact energy.

This is one reason a helmet can require replacement after a significant impact even when its outer appearance does not show obvious damage.

For replacement guidance, read our when to replace a helmet guide.

ABS Helmet Shells

ABS stands for acrylonitrile butadiene styrene. It is a thermoplastic material used in many consumer products, including some motorcycle and recreational helmet shells.

ABS helmets are often found at affordable price points and can be produced in a wide range of shapes and finishes.

Possible advantages of ABS helmet shells can include:

• Relatively affordable manufacturing
• Good shape consistency
• Resistance to normal knocks and surface wear
• Wide availability

However, you should not judge an ABS helmet based only on the material name. Two ABS helmets can differ in shell thickness, liner design, weight, fit, ventilation, certification and overall construction.

Are ABS Helmets Good?

An ABS helmet can be a reasonable choice when it is designed for your activity, fits correctly and carries the applicable safety information for your market.

It is not accurate to say that every ABS helmet is either good or bad simply because it uses ABS plastic.

Instead, check the exact product, including:

• Intended use
• Applicable certification
• Size range
• Fit
• Weight
• Ventilation
• Retention system
• Manufacturer information

Polycarbonate Helmet Shells

Polycarbonate is another thermoplastic material commonly used in helmet shells. It is often chosen because it can be molded into complex shapes and offers useful impact and durability characteristics for helmet manufacturing.

Polycarbonate helmets are available across different price ranges. Some manufacturers use their own branded names for polycarbonate-based shell materials.

As with ABS, the fact that a helmet uses polycarbonate does not tell you everything about its performance.

The shell must be considered together with the liner, helmet design, certification, fit and other components.

ABS vs Polycarbonate Helmets

ABS and polycarbonate are both thermoplastics, but manufacturers may use different formulations, molding methods and shell designs.

Factor	ABS	Polycarbonate
Material type	Thermoplastic	Thermoplastic
Common price range	Often budget to mid-range	Budget to mid-range and above
Moldability	Good	Good
Weight	Depends on design	Depends on design
Safety performance	Depends on complete helmet	Depends on complete helmet

Do not choose between ABS and polycarbonate only by looking at the table. The specific helmet matters more than the material category alone.

Fiberglass Helmet Shells

Fiberglass shells are made using glass fibers combined with a resin system. They are often found in mid-range and premium motorcycle helmets.

Fiberglass construction allows manufacturers to build shells using layers of reinforcing fibers rather than relying only on molded thermoplastic.

Possible reasons manufacturers use fiberglass include:

• Ability to create layered shell structures
• Potential for lower shell weight depending on design
• Different flexibility and impact characteristics compared with some thermoplastics
• Use in complex composite constructions

Again, fiberglass should not be treated as proof that one helmet is automatically better than another.

What Is a Composite Helmet?

A composite helmet shell uses more than one reinforcing material or a combination of fibers and resins.

Depending on the manufacturer, a composite shell may combine materials such as:

• Fiberglass
• Aramid fibers
• Carbon fibers
• Other reinforcing fibers

The exact mixture, layering and manufacturing process vary between brands.

Terms such as "advanced composite" can sound impressive, but buyers should look for actual product specifications rather than relying on marketing language alone.

Carbon Fiber Helmet Shells

Carbon fiber is a lightweight reinforcing material used in some premium motorcycle helmet shells. Carbon fibers are typically combined with resin and formed into a layered structure.

Carbon fiber is often associated with higher-priced helmets because the material and manufacturing process can be more complex than basic thermoplastic molding.

One of the main reasons riders consider carbon fiber is weight.

A carefully designed carbon fiber helmet may weigh less than a comparable helmet using another shell construction. However, this depends on the helmet's size, shape, visor system, liner, accessories and overall design.

Is a Carbon Fiber Helmet Better?

A carbon fiber shell does not automatically make a helmet the best choice for every rider.

Before paying more for carbon fiber, compare:

• Applicable safety certification
• Helmet fit
• Head shape
• Total helmet weight
• Balance
• Ventilation
• Visor system
• Comfort padding
• Price

A less expensive helmet that fits your head correctly and meets the applicable standard can be a more suitable choice than an expensive carbon fiber helmet that fits poorly.

Carbon Fiber vs Fiberglass Helmets

Both carbon fiber and fiberglass can be used in layered helmet shells, but they have different material properties and manufacturing costs.

Carbon fiber is commonly associated with lower weight and premium pricing. Fiberglass can also be used to create relatively lightweight shells and is widely used in quality motorcycle helmets.

Factor	Fiberglass	Carbon Fiber
Construction	Glass fiber with resin	Carbon fiber with resin
Typical price	Mid-range to premium	Often premium
Potential weight	Can be relatively light	Often selected for lower weight
Performance	Depends on complete helmet design	Depends on complete helmet design

What Are Aramid Fibers?

Aramid fibers are another type of reinforcing material used in some composite helmet shells.

You may see manufacturers mention aramid as part of a multi-material shell construction rather than as the only material.

As with carbon fiber and fiberglass, the material name does not tell you the complete story.

How the fibers are layered, combined with resin, shaped and integrated with the rest of the helmet matters.

Thermoplastic vs Composite Helmets

Thermoplastic helmets such as ABS and polycarbonate shells are generally produced by molding heated plastic into shape.

Composite helmets use reinforcing fibers combined with resin and are often built using layered manufacturing methods.

General differences can include:

• Manufacturing method
• Material cost
• Shell thickness
• Weight
• Price

These are broad differences rather than guarantees.

You should not assume that every composite helmet is lighter than every thermoplastic helmet or that every expensive helmet fits better.

Helmet Material and Weight

Weight is one of the main factors riders compare when looking at different helmet materials.

A lighter helmet may feel more comfortable during long rides, but the shell material is only one factor affecting weight.

Total helmet weight can also be influenced by:

• Helmet size
• Shell size
• Impact liner
• Visor mechanism
• Internal sun visor
• Ventilation system
• Communication components
• Modular mechanisms

For this reason, compare the manufacturer's actual weight figures instead of assuming the material alone determines weight.

Helmet Balance Matters Too

Two helmets with similar published weights can feel different when worn.

This is because weight distribution and balance can affect how the helmet feels on your head.

A helmet that feels front-heavy may be less comfortable for some riders even if its total weight looks competitive on paper.

Correct fit also affects how weight is distributed.

Use our helmet fit guide before deciding whether a helmet feels suitable.

Does Helmet Material Affect Ventilation?

The shell material itself does not determine how well a helmet ventilates.

Ventilation depends more directly on factors such as:

• Vent placement
• Vent size
• Internal channels
• Exhaust ports
• Padding design
• Helmet shape

A carbon fiber helmet can have poor ventilation, while a thermoplastic helmet can have excellent airflow, depending on the design.

Read our helmet ventilation guide if airflow is important to you.

Does Helmet Material Affect Fit?

Shell material does not tell you whether a helmet will fit your head.

Fit depends on:

• Internal head shape
• Helmet size
• Comfort liner
• Cheek pads
• Retention system
• Adjustment system

Always measure your head before choosing a helmet.

Our head measurement guide and helmet size guide explain the process.

Do Expensive Helmet Materials Mean Better Safety?

Price and shell material should not be treated as direct measurements of safety.

A premium helmet can cost more because of:

• Shell construction
• Lower weight
• Complex ventilation
• Premium padding
• Visor mechanisms
• Noise management
• Finish quality
• Accessories
• Brand positioning

The correct way to check safety information is to review the applicable standard or certification for the exact helmet.

A higher price does not replace the need for certification, correct fit and proper use.

Helmet Materials and Safety Standards

A helmet should be evaluated against the applicable standard for its intended activity and market rather than simply by the shell material.

For example, bicycle helmets sold in the United States are subject to applicable CPSC requirements, while motorcycle helmets intended for U.S. road use should carry the required DOT certification information relating to FMVSS No. 218.

A manufacturer can potentially design compliant helmets using different shell materials.

This is why statements such as "carbon fiber is always safest" or "plastic helmets are unsafe" are too broad and can be misleading.

Bicycle Helmet Materials

Bicycle helmet construction can differ from many motorcycle helmets.

Many bicycle helmets use a hard or thin outer shell combined with an impact-management liner. Some use an in-mold construction method where the shell and liner are formed closely together during manufacturing.

Higher-end bicycle helmets may include additional internal structures or reinforcing materials, but the same buying principles still apply.

Check:

• Intended cycling use
• Applicable safety information
• Size
• Fit
• Coverage
• Ventilation
• Weight

Motorcycle Helmet Materials

Motorcycle helmets commonly use thicker shell constructions than bicycle helmets and may be made from thermoplastic, fiberglass, composite or carbon fiber materials.

The shell also needs to work with a deeper impact-management liner, retention system, comfort liner, vents and visor components.

Motorcycle riders should not select a helmet based only on the shell material.

For the full buying process, see our motorcycle helmet buying guide.

Can Helmet Materials Deteriorate?

Helmet components can be affected over time by use, heat, impacts, chemicals, improper storage and wear.

The exact effects depend on the materials and manufacturer.

Avoid storing helmets in unusually hot environments or using strong solvents and cleaning chemicals unless specifically approved.

Our helmet cleaning guide explains safer maintenance practices.

Do Not Modify Helmet Materials

Do not modify the shell or impact liner in an attempt to reduce weight, improve fit or create more ventilation.

Avoid:

• Drilling holes
• Cutting the shell
• Sanding impact foam
• Removing structural material
• Using unapproved adhesives
• Reshaping the liner

If the helmet does not fit or ventilate well enough, choose another model rather than altering the helmet.

How to Compare Helmet Materials When Shopping Online

When comparing helmets online, use the material information as one part of a larger checklist.

Check:

1. Intended use: Make sure the helmet is designed for your activity.
2. Safety information: Confirm the applicable certification.
3. Shell material: Identify whether it uses thermoplastic, fiberglass, composite or carbon fiber.
4. Published weight: Compare similar helmet sizes.
5. Fit information: Check the size chart and head shape.
6. Ventilation: Review vent and airflow features.
7. Visor: Confirm what shield is included.
8. Replacement parts: Check the availability of liners, cheek pads and visors where relevant.

Helmet Material Buying Checklist

• Do not choose a helmet based on shell material alone.
• Check the applicable safety standard.
• Verify the certification for the exact model.
• Measure your head before choosing a size.
• Consider helmet head shape.
• Compare actual helmet weight rather than assumptions.
• Check ventilation and comfort features.
• Review the complete helmet construction.
• Do not assume carbon fiber is automatically safer.
• Do not assume a lower-priced thermoplastic helmet is automatically unsuitable.
• Follow manufacturer cleaning and storage instructions.
• Do not modify the shell or impact liner.

Frequently Asked Questions About Helmet Materials

What is the best material for a helmet?

There is no single shell material that is automatically best for every rider. ABS, polycarbonate, fiberglass, composite and carbon fiber can all be used in helmet construction. Compare the complete helmet, applicable certification, fit, weight, comfort and intended use.

Is carbon fiber better than polycarbonate?

Carbon fiber is often used in premium helmets and may allow lower shell weight depending on the design. Polycarbonate is widely used in helmets across different price ranges. The better choice depends on the exact helmet rather than material alone.

Are ABS helmets safe?

Safety should be determined by the applicable certification and complete helmet design rather than the ABS material name alone. Check whether the exact helmet is intended and certified for your activity and market.

Are fiberglass helmets lighter?

Fiberglass construction can be used to create relatively lightweight helmets, but total weight depends on the entire helmet, including its size, liner, visor, ventilation and other components.

Why are carbon fiber helmets more expensive?

Carbon fiber materials and manufacturing processes can be more costly. Premium helmets may also include additional features such as advanced ventilation, removable liners, visor systems and higher-end finishes.

Does a heavier helmet provide better protection?

Helmet weight alone does not determine protection. Check the applicable safety standard, intended use and complete helmet design instead of assuming heavier means safer.

Does helmet shell material affect ventilation?

Ventilation depends mainly on vent design, internal channels, exhaust ports and padding rather than the shell material itself.

Final Thoughts on Helmet Materials

Understanding helmet materials can help you compare products, but shell material should remain only one part of your decision. ABS, polycarbonate, fiberglass, composite and carbon fiber constructions each have different manufacturing characteristics, costs and potential weight differences.

Do not assume that the most expensive material automatically gives you the best helmet. Start with the correct helmet category and applicable safety standard. Then check size, head shape, fit, weight, ventilation, visor features and comfort.

For the full buying process, return to our helmet buying guide. You can also read our helmet safety standards guide, helmet size guide, head measurement guide, helmet fit guide, helmet ventilation guide, helmet replacement guide, and helmet cleaning guide before making your final choice.