SLS 3D Printing for Sports Protective Gear: Helmet Liner Applications
Protective sports equipment is undergoing a quiet revolution. For decades, helmets relied on foam padding—expanded polystyrene (EPS), polyurethane, or EVA—to absorb impact energy. These materials work, but they come with trade-offs: weight, heat retention, limited breathability, and a one-size-fits-most approach that leaves many athletes with less-than-perfect fit.
Selective Laser Sintering (SLS) is changing that paradigm. By enabling complex lattice structures in durable nylon materials, SLS is creating helmet liners that are lighter, more breathable, more comfortable, and potentially safer than traditional foam.
Recently, Zongheng3D used the SLS2030 industrial 3D printer to produce a helmet liner prototype for facial and forehead impact protection. This article explores the project, the technology behind it, and the broader implications for sports protective gear manufacturing.
The SLS2030: Built for Protective Gear Production
The Supermaker SLS2030 is an industrial-grade SLS printer designed for medium to large part production. Key specifications relevant to helmet liner manufacturing include:
| Specification | SLS2030 |
| Build volume | 200*200*300 mm (medium to large parts) |
| Layer thickness | 0.1 - 0.3 mm |
| Max volumetric build rate | 3,000 cm³/h |
| Materials | PA11, PA12, TPU, glass-filled nylon |
| Powder start-up | 8 kg |
| Cycle time | ≤10 hours for full build |
The SLS2030 is equipped with a fiber laser option for wider material compatibility and improved print quality. Its high-speed double-sided powder feeding system allows printing to start with just 8 kg of powder, significantly reducing material waste and operational costs.
For helmet liner applications, the SLS2030 offers two critical advantages:
Large build volume: Accommodates full helmet liner geometries without splitting or assembly
Fast cycle times: ≤10 hours per full build enables rapid prototyping and production scaling
Why Helmets Need Better Liners
The liner is the interface between the helmet shell and the athlete's head. It does more than provide comfort—it is the primary energy-absorbing layer during impact.
The Limitations of Traditional Foam
Traditional foam liners have several inherent limitations:
Weight: Foam adds significant mass to helmets, affecting athlete fatigue and performance.
Heat retention: Foam lacks breathability, leading to overheating during intense activity.
Permanent compression: Foam degrades over time, reducing protective performance.
Limited customization: Foam liners are typically produced in standard sizes, offering limited fit for individual head shapes.
One study of helmet liner design noted that while traditional foam liners may provide suitable protection against impact, they "tend to be heavy and have limited breathability and sweat management capabilities, which may affect the wearer's comfort" .
The Unique Challenge of Forehead and Temple Fit
The forehead and temple areas are particularly sensitive to fit issues. As a patent for lattice helmet liners explains, "seams between adjacent paddings are positioned such that they are not located in areas of the liner that have the greatest impact on the comfort of the wearer—such as the front padding which comes into contact with the wearer's forehead, and the side paddings which come into contact with the wearer's temples" .
In other words, the critical comfort zones require seamless, continuous surfaces something traditional foam struggles to achieve consistently.
How SLS Solves These Problems
SLS offers capabilities that directly address the limitations of traditional foam liners.
Lattice Structures for Lightweight Impact Absorption
SLS can produce complex lattice structures—repeating patterns of struts and pores that distribute impact forces across a larger area. These structures:
Reduce weight by removing material where it is not structurally needed
Improve breathability through open-cell designs that allow airflow
Enhance energy absorption through controlled deformation during impact
A 2026 study published in Thin-Walled Structures evaluated 3D-printed helmet liners with lattice and honeycomb architectures. The research found that "hybrid graded lattices achieved an optimal balanced performance, combining efficient energy absorption, reduced HIC15, and a relatively lower weight" .
Customization Without Tooling
One of SLS's greatest advantages is the ability to customize each liner without costly tooling. An athlete's head can be scanned, the data used to create a digital model, and a perfectly fitting liner printed—all without new molds.
As one helmet manufacturer explained: "Whether elite athletes or pond hockey players, no two heads are alike" . SLS enables mass customization at scale.
Support-Free Complex Geometry
SLS requires no support structures. The unsintered powder bed supports the part during printing, enabling geometries—like complex lattice structures and internal channels—that would be impossible with other 3D printing technologies or traditional manufacturing. This is particularly valuable for helmet liners, where internal features must be optimized for both comfort and protection.
Real-World Applications
SLS technology is already being used in commercial sports protective gear.
Bauer REAKT Hockey Helmet
Bauer Hockey partnered with EOS to develop the REAKT helmet, featuring SLS-printed liner inserts .
The process works like this:
A player's head is scanned
A digital file is created
EOS Selective Laser Sintering technology prints the liner
The printed parts are colored, finished, and assembled
The result is a helmet "created to fit the wearer perfectly" . The lattice design reduces weight, improves breathability, and provides customized protection. Bauer launched the REAKT helmet in the NHL with players including Cale Makar and Jack Eichel, and it is now available through 300 global retailers with custom delivery in four weeks.
Snow Sled Helmet for Chinese National Team
A Dongguan-developed snow sled helmet using SLS technology was delivered to the Chinese national team. Compared to existing helmets, this new design weighs 20% less, has a 9.7% lower drag coefficient, and significantly improved comfort .
The project, recognized as "international leading and globally pioneering," used topological optimization and lightweight design of the helmet cushioning layer, with SLS laser sintering technology in the manufacturing process .
XO Armor Technologies
XO Armor Technologies, born from Auburn University research, provides custom 3D-printed protective gear to more than 40 college and professional sports teams . Using an iPhone scan, trainers select attributes like thickness and flexibility, and an on-site 3D printer creates custom padding in less than an hour.
Football is the main driver, but the company also serves baseball, rugby, hockey teams, and military and medical applications.
The Science Behind SLS Helmet Liners
Impact Performance
Research confirms that SLS-printed lattice structures can match or exceed traditional foam performance. A computational study on PA12 lattice structures for helmet liners found that "some lattice types show greatly increased protection compared to EPS liners" .
The study evaluated three different uniform lattice types additively manufactured with polyamide 12 (PA12)—a material commonly used in SLS printing. PA12 offers the strength, flexibility, and fatigue resistance needed for impact applications.
Materials Matter
PA12 and PA11 nylon are the most common SLS materials for protective applications. They offer:
Elongation and fatigue resistance needed for repeated impact absorption
Chemical resistance to sweat and environmental factors
Dimensional stability for consistent fit
For helmet liners, material selection is critical. The lattice must deform predictably under impact, absorbing energy without fracturing. PA12's mechanical properties make it ideal for this application.
Design Considerations for SLS Helmet Liners
Lattice Architecture
Different lattice geometries offer different performance characteristics:
Honeycomb structures offer high energy absorption but add weight
Single-type lattices offer lower energy absorption with reduced weight
Hybrid graded lattices achieve optimal balance of energy absorption, impact mitigation, and weight
Beijing Industry University researchers developed a "collapsible composite structure helmet liner based on SLS process" that combines different lattice types to improve impact resistance .
Forehead and Temple Comfort
The critical comfort areas—forehead and temples—require specific design attention. A lattice helmet liner design patent emphasizes that seams and creases should be positioned to avoid these areas, maintaining a "substantially seamless surface on the inside of the liner padding" .
Breathability and Moisture Management
SLS lattice structures naturally provide airflow channels. As Bauer's product development demonstrates, lattice designs "effectively reduce helmet weight and improve breathability" .
Graded Lattice Structures
2026 research shows that "graded lattice structures" offer superior performance by varying the lattice density across the liner. The study found that "foam-filled Kagome–Voronoi and Kelvin–Voronoi graded lattices demonstrated superior overall performance in energy absorption, impact mitigation, and shock wave attenuation within the constrained clearance between helmet and head" .
This approach—varying density based on impact risk in different head regions—is only possible with additive manufacturing.
The Future of SLS in Protective Gear
The applications for SLS protective gear extend beyond helmets. A patent for lattice products notes that the technology can be used for "a brace, arm, link, shock absorber, cushion or pad, neck brace, chest protector, protective vest, protective jacket" and even "footwear insole, midsole, or orthotic insert" .
University research is exploring SLS-printed cushion layers for ski protective clothing using gyroid lattice structures to improve both safety and comfort .
Frequently Asked Questions
Why is SLS better than foam for helmet liners?
SLS lattice structures offer lighter weight, better breathability, and customizable fit without the cost of tooling. Research shows SLS-printed lattices can provide equal or better impact protection than EPS foam .
What materials are used for SLS helmet liners?
PA12/PA11 nylon and TPU are the most common materials. They offer the strength, flexibility, and fatigue resistance needed for impact absorption.
Can SLS helmet liners be customized for individual athletes?
Yes. An athlete's head can be scanned to create a digital file, which is then used to print a custom-fitted liner—all without new tooling .
How do SLS liners compare to traditional foam for impact protection?
Studies show that SLS-printed lattice structures can match or exceed EPS foam performance. Some lattice types provide "greatly increased protection compared to EPS liners" .
Are SLS helmet liners being used in professional sports?
Yes. Bauer's REAKT helmet is worn by NHL players, and XO Armor Technologies provides custom 3D-printed protective gear to over 40 college and professional teams .
Conclusion
SLS 3D printing is transforming sports protective gear by enabling helmet liners that are lighter, more breathable, and better fitting than traditional foam. The technology's ability to produce complex lattice structures in durable nylon materials—without tooling or support structures—makes it ideal for applications where comfort and protection are both critical.
From Bauer's REAKT hockey helmet to the Chinese national snow sled team's custom helmets, SLS is proving itself as a production-ready technology for protective sports equipment.
The Supermaker SLS2030 offers the precision, build volume, and material versatility required for protective gear manufacturing. With its 200 x 200 x 300 mm build capacity and support for engineering-grade nylon materials, it can handle both prototyping and production runs of custom helmet liners and other protective components.
