What Is EPS In-Mold Technology?

An in-mold helmet typically consists of two main structural materials:

Polycarbonate Outer Shell

The PC shell forms the lightweight external surface of the helmet. It protects the EPS liner from everyday wear and allows designers to create complex shapes, ventilation openings, colors and graphics.

EPS Impact-Absorbing Liner

EPS, or Expanded Polystyrene, is the lightweight foam structure inside the helmet. During an impact, the EPS liner is designed to deform and crush to help manage impact energy.

During the in-mold process, the EPS liner is molded directly against the prepared PC shell.

PC Shell + EPS Liner = Integrated In-Mold Helmet Construction

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Why Use In-Mold Technology?

Lightweight Construction

In-mold construction is well suited to performance helmets where low weight and comfort are important.

Integrated Structure

The EPS liner is formed directly inside the outer shell, allowing both components to work together as one helmet structure.

Greater Design Freedom

In-mold technology allows helmet designers to create:

• Large ventilation openings
• Deep internal airflow channels
• Aerodynamic helmet shapes
• Multi-shell constructions
• Lightweight performance designs

Optimized Ventilation

Modern bicycle helmets depend on more than simply adding more vents.

Effective airflow requires an engineered relationship between:

Front Air Intake → Internal Air Channels → Rear Exhaust

In-mold construction gives designers greater flexibility to develop these ventilation structures within the EPS liner.

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Engineering Beyond EPS Foam

A professional helmet is not designed by considering EPS density alone.

Aurora engineers evaluate the complete helmet structure, including:

• EPS density and thickness
• PC shell geometry
• Ventilation layout
• Internal airflow channels
• Helmet coverage
• Reinforcement structures
• Fit-system integration
• Target weight
• Applicable helmet standards

Each element can influence the others.

For highly ventilated or lightweight helmet designs, additional internal reinforcement may also be incorporated into the EPS liner.

Aurora’s IRF™ Integrated Reinforcement Frame Technology is one example of this approach, using an internal structural frame to reinforce selected areas of the helmet while supporting lightweight and highly ventilated designs.

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Aurora In-Mold Helmet Manufacturing Expertise

Aurora Sports supports helmet projects through the complete development process:

Concept → Industrial Design → Engineering → Prototype → Tooling → Testing → In-Mold Manufacturing → Assembly → Quality Control → Mass Production

Our manufacturing capabilities include:

• Helmet industrial design
• Structural engineering
• Rapid prototyping
• Tooling development
• Vacuum forming
• EPS in-mold production
• Plastic injection
• Helmet assembly
• Testing support
• Quality control
• OEM/ODM mass production

By combining design, engineering and manufacturing capabilities, we can evaluate both product performance and production feasibility from the early stages of development.

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Custom EPS In-Mold Helmet Development

Aurora works with helmet brands, distributors, startups and product developers worldwide.

Whether you have:

• An initial helmet concept
• A sketch or rendering
• Existing CAD data
• A helmet you want to improve
• A complete OEM/ODM project

our team can support the project from development through production.

Develop Your Next In-Mold Helmet With Aurora

Looking for an experienced EPS in-mold helmet manufacturer?

Talk to Aurora Sports about your next custom bicycle helmet, cycling helmet or protective helmet project.