Technical sheet

Oneal Defender Solid MTB Helmet

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Features of Oneal Defender Solid

Product description of Oneal Defender Solid MTB Helmet

Description summary

Conquer any trail with the O´Neal Defender Solid MTB Helmet. Designed for all-mountain and enduro riders, this lightweight helmet boasts advanced double-inmold construction for superior impact protection and durability. Stay cool and focused with its optimized ventilation system, while the customizable fit and O´Neal Fidlock® magnetic buckle ensure secure, one-handed operation. Certified to EN1078 and CPSC standards, the Defender offers uncompromising safety and style with a premium matte finish

ONeal Defender Solid MTB Helmet

Attributes: Adult, No Technology, Synthetic

Unleash your full potential on the trails with the O´Neal Defender Solid MTB Helmet, the definitive choice for dedicated all-mountain and enduro riders. This helmet is the complete package, meticulously engineered to offer a superior blend of lightweight performance, exceptional ventilation, and uncompromising safety. Whether you´re grinding up a technical climb or charging through demanding descents, the Defender is your trusted partner, providing the confidence you need to push your limits. Its sleek, modern design with a premium matte finish ensures you look as good as you feel, making it a standout piece of equipment in any mountain biker´s arsenal.

Experience a new level of protection with the helmet´s advanced double-inmold construction. This state-of-the-art technology robustly fuses the impact-absorbing inner EPS layer with a durable polycarbonate outer shell. An additional second shell layer is strategically placed to protect the outer edges from daily wear and tear, significantly enhancing the helmet´s longevity and its ability to manage impacts. This lightweight yet incredibly strong design meets both EN1078 and CPSC safety standards, giving you certified peace of mind on every ride.

Comfort is paramount during long days on the bike, and the Defender excels with its optimized ventilation system. Generously sized ventilation openings work in harmony with deep internal air channels to create a constant, cooling airflow over your head. This system efficiently draws in cool air and expels hot, stale air, ensuring you remain comfortable and focused, even during the most intense efforts in warm weather.

Achieving a perfect, secure fit is effortless. The Defender features a comprehensive adjustment system that allows for precise customization. A user-friendly adjustment wheel at the rear controls both the height and width of the retention system, ensuring the helmet sits perfectly and securely on your head without creating pressure points. This personalized fit is critical for both comfort and safety, preventing the helmet from shifting during aggressive riding. A standout feature is the innovative O’Neal Fidlock® magnetic buckle, an engineering marvel that allows for quick, easy, and secure fastening and release with just one hand, even with gloves on. It provides maximum security while riding and eliminates the hassle of traditional clips.
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Features:
- Light, well-ventilated and stylish, the DEFENDER is our complete package for all-mountain and enduro. With double-inmold technology, robust for action on the trails.
- The lightweight Inmold technology fuses the inner EPS and outer shell together, with an additional second layer protecting the outer edges and improving impact absorption.
- The ventilation openings and internal ventilation channels ensure optimized air circulation.
- Easily adjustable helmet peak with locking points.
- O´Neal Fidlock® magnetic buckle engineered for easy, single-handed fastening and release, provides maximum security while riding.
- Perfectly adjustable seat thanks to height and width adjustment with adjustment wheel.
- Matte finish.
- Meets EN1078 and CPSC safety standard for bicycle Helmets.
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Specifications:
- Weight: 400g (±25g)
- Material: Outer Shell: 68% EPS, 32% Polycarbonate; Padding: 100% Polyurethane-Foam; Liner: 100% Polyester

EN1078 IMPORTANT NOTE This helmet has been built, tested and approved according to the European regulations ECE/ONU R22.05. TRADEINN is not responsible for the use that may be made of this helmet in other countries that are not subject to this European homologation ECE/ONU R22.05, discouraging the use of this in those countries.

Specifications

Manual

Size chart

Technical specifications of Oneal Defender Solid

Weight

400g (±25g)
Construction

Composite
Certifications

EN 1078, CPSC
Intended use

MTB, Enduro, All-Mountain
Padding

100% Polyurethane-Foam
Closure system

O´Neal Fidlock® Magnetic Buckle
Safety system

Second Layer Protecting Outer Edges And Improving Impact Absorption
Ventilation / Breathability

Ventilation Openings And Internal Ventilation Channels Ensure Optimized Air Circulation
Color

Beige
Age

Adult

Features of Oneal Defender Solid

Color Beige

Color

Beige

Age Adult

Age

Adult

Key differentiators

Certified to both EN 1078 and CPSC safety standards for reliable protection.

Composite construction includes a second layer to protect outer edges and improve impact absorption.

Comprehensive fit system with a rear adjustment wheel for both height and width.

Features the O'Neal Fidlock® magnetic buckle for easy, one-handed fastening and release.

Optimized ventilation with internal channels for enhanced airflow and comfort.

Technology in Oneal Defender Solid MTB Helmet

Energy rating

Warnings

/ 5

1 Reviews

What our customers are saying about Oneal Defender Solid MTB Helmet

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Include AI Generated questions and answers

2026-09-04

Generated by AI and verified

What type of riding is the Oneal Defender Solid MTB Helmet designed for?

Answer of Generated by AI and verified

This helmet is specifically designed for All-Mountain, Enduro, and general MTB riding. Its features are optimized to provide protection and comfort for these demanding disciplines.

* Generated by AI based on customer and product data

2026-09-04

Generated by AI and verified

What safety standards does the Oneal Defender helmet meet?

Answer of Generated by AI and verified

We confirm that the Oneal Defender Solid MTB Helmet is certified to meet both EN 1078 and CPSC safety standards, ensuring it has passed rigorous testing for impact protection.

* Generated by AI based on customer and product data

2026-09-04

Generated by AI and verified

Is the visor on this helmet included?

Answer of Generated by AI and verified

Yes, the Oneal Defender Solid MTB Helmet includes a visor.

* Generated by AI based on customer and product data

2026-09-04

Generated by AI and verified

Is this helmet suitable for adults?

Answer of Generated by AI and verified

Yes, this helmet is designed for the adult age group.

* Generated by AI based on customer and product data

2026-09-04

Generated by AI and verified

What materials are used to construct the Oneal Defender helmet?

Answer of Generated by AI and verified

The helmet's outer shell is a composite made of 68% EPS and 32% Polycarbonate. The internal padding is 100% Polyurethane-Foam, and the liner is 100% Polyester.

* Generated by AI based on customer and product data

2026-09-04

Generated by AI and verified

How does the helmet's closure system work?

Answer of Generated by AI and verified

This helmet features the O'Neal Fidlock® magnetic buckle. This system allows for easy and secure one-handed fastening and release, even while wearing gloves.

* Generated by AI based on customer and product data

2026-09-04

Generated by AI and verified

How much does the Oneal Defender Solid MTB Helmet weigh?

Answer of Generated by AI and verified

The helmet has a specified weight of 400g, with a tolerance of ±25g.

* Generated by AI based on customer and product data

2026-09-04

Generated by AI and verified

What kind of ventilation does this helmet have?

Answer of Generated by AI and verified

The helmet is designed with ventilation openings and internal channels that work together to provide optimized air circulation, helping to keep you cool during your ride.

* Generated by AI based on customer and product data

2026-09-04

Generated by AI and verified

How do I adjust the fit of the Oneal Defender helmet?

Answer of Generated by AI and verified

The helmet is equipped with a comprehensive adjustment system. You can customize the fit using the adjustment wheel for both height and width, ensuring a secure and comfortable feel.

* Generated by AI based on customer and product data

2026-09-04

Generated by AI and verified

How does this helmet enhance impact protection?

Answer of Generated by AI and verified

The helmet utilizes a double-inmold construction and features a second protective layer over the outer edges. This design improves impact absorption and increases durability against daily wear.

* Generated by AI based on customer and product data

2026-09-04

Generated by AI and verified

Are the straps on this helmet adjustable?

Answer of Generated by AI and verified

Yes, the helmet comes with adjustable straps, allowing you to achieve a secure and personalized fit.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

What type of riding is the Oneal Defender Solid MTB Helmet designed for?

Answer of Generated by AI and verified

This helmet is specifically designed for adult riders participating in All-Mountain, Enduro, and general MTB (Mountain Biking) activities.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

What safety standards does the Oneal Defender Solid helmet meet?

Answer of Generated by AI and verified

This helmet is certified to meet both EN 1078 and CPSC safety standards.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

What materials are used to construct this helmet?

Answer of Generated by AI and verified

The helmet's shell is made from a composite of 68% EPS and 32% Polycarbonate. The padding is 100% Polyurethane-Foam, and the liner is 100% Polyester.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

How does the helmet's ventilation system work?

Answer of Generated by AI and verified

The helmet features ventilation openings and internal ventilation channels that are designed to ensure optimized air circulation to keep you cool. The ventilation is also adjustable.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

What kind of adjustment system does this helmet have?

Answer of Generated by AI and verified

The helmet is equipped with a comprehensive adjustment system that includes an adjustment wheel to control both the height and width for a customized fit.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

What is the main benefit of the O'Neal Fidlock® magnetic buckle?

Answer of Generated by AI and verified

The O'Neal Fidlock® magnetic buckle is designed for secure, one-handed operation, making it easier and faster to fasten and unfasten your helmet.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

Is the visor on this helmet adjustable?

Answer of Generated by AI and verified

Yes, the helmet includes an easily adjustable helmet peak, allowing you to position it for optimal sun and debris protection.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

Can I use this helmet for road cycling or commuting?

Answer of Generated by AI and verified

While this helmet is safety certified, it is specifically designed and optimized for MTB, Enduro, and All-Mountain riding. Its features, like the visor and ventilation design, are tailored for those activities.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

What is the 'double-inmold' construction?

Answer of Generated by AI and verified

The double-inmold construction is a manufacturing technology that fuses the inner EPS layer with the polycarbonate outer shell. This helmet also features a second shell layer to protect the outer edges, enhancing durability and impact absorption.

* Generated by AI based on customer and product data

2026-09-06

Generated by AI and verified

How does the ventilation of the Defender Solid compare to the Leatt MTB Allmtn 1.0 helmet?

Answer of Generated by AI and verified

The Oneal Defender Solid helmet features ventilation openings and internal channels for optimized air circulation, and its ventilation is adjustable. The Leatt MTB Allmtn 1.0 is specified to have 14 vents for maximized ventilation, even at low speeds.

* Generated by AI based on customer and product data

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Frequently bought together

Best sellers

Use cases

All-Mountain Riding 90% Fit

This helmet is specifically designed for All-Mountain use, offering a balanced combination of protection, ventilation, and a secure fit for varied terrain. The composite construction and second protective layer provide reliable impact absorption for both climbs and descents.

Composite construction,Second Layer Protecting Outer Edges And Improving Impact Absorption,Ventilation Openings And Internal Ventilation Channels,Comprehensive adjustment system

Enduro Riding 90% Fit

Built for the demands of Enduro, this helmet provides enhanced protection with its double-inmold technology and meets EN1078 and CPSC safety standards. The O'Neal Fidlock® magnetic buckle allows for quick, secure fastening, which is ideal for timed stages.

O´Neal Fidlock® Magnetic Buckle,Safety certifications: EN 1078, CPSC,Second Layer Protecting Outer Edges And Improving Impact Absorption,intended_use: Enduro

General Mountain Biking (MTB) 85% Fit

As a versatile MTB helmet, it offers solid performance for trail riding with optimized air circulation to keep you cool. The adjustable fit system ensures comfort on long rides, while the certified protection gives you peace of mind on technical sections.

Ventilation Openings And Internal Ventilation Channels,Comprehensive adjustment system with height and width adjustment wheel,Safety certifications: EN 1078, CPSC,Composite construction

Trail System Exploration 80% Fit

For riders exploring extensive trail networks, the helmet's 400g weight and effective ventilation provide lasting comfort. The secure and easily adjustable fit system, combined with the Fidlock® buckle, ensures it stays comfortably in place throughout a long day of riding.

helmet_weight: 400g (±25g),Ventilation Openings And Internal Ventilation Channels,O´Neal Fidlock® Magnetic Buckle,Comprehensive adjustment system

Best for

Best for Safety-Conscious Riders

This helmet meets both EN1078 and CPSC safety certifications and features a second protective layer to improve impact absorption, offering certified peace of mind on the trails.

Ideal for Trail Riders

With optimized air circulation from internal ventilation channels and a comprehensive adjustment system for a secure fit, this helmet is built for comfort and performance on All-Mountain and Enduro trails.

A Great Upgrade for Regular MTB Riders

Featuring the convenient O'Neal Fidlock® magnetic buckle for easy one-handed operation and a composite construction, this helmet provides a solid, dependable upgrade for frequent use.

Perfect for Trail Riders

The helmet's sleek design and modern matte finish provide a sharp, contemporary look without compromising on the critical safety and performance features needed for the trail.

Benefits

FunctionalAchieve a Personalized and Secure Fit

Enjoy a comfortable and secure fit on every ride with a comprehensive adjustment system. This helmet features a dial for both height and width adjustments, complemented by polyurethane foam padding and adjustable straps for a personalized feel during long sessions on the trail.

Fit system: height and width adjustment with adjustment wheel

Adjustment system: comprehensive adjustment system with height and width adjustment wheel

Padding: 100% Polyurethane-Foam

Adjustable straps: Yes

FunctionalEnhanced Impact Absorption for Demanding Trails

This helmet's composite construction includes a second protective layer specifically designed to improve impact absorption and protect the outer edges. This safety system provides added resilience for MTB, Enduro, and All-Mountain riding.

Safety system: Second Layer Protecting Outer Edges And Improving Impact Absorption

Material: Outer Shell: 68% EPS

32% Polycarbonate; Padding: 100% Polyurethane-Foam; Liner: 100% Polyester

FunctionalRide with Confidence from Certified Safety

Feel secure on your rides knowing this helmet meets both EN 1078 and CPSC safety certifications. This verified level of protection allows you to focus on the trail ahead with greater peace of mind.

Safety certifications: EN 1078

CPSC

Intended use: MTB

Enduro

All-Mountain

FunctionalEffortless and Secure Fastening

Secure your helmet quickly and reliably with the O'Neal Fidlock® Magnetic Buckle. This system allows for easy, one-handed fastening and unfastening, adding convenience without compromising on safety.

Closure system: O´Neal Fidlock® Magnetic Buckle

Ideal buyer profiles

The Safety-First Rider

This rider prioritizes certified protection above all else for their all-mountain and enduro adventures. They seek a helmet that meets rigorous safety standards and incorporates features designed to enhance impact absorption and security, giving them peace of mind on challenging trails.

The Oneal Defender helmet is an excellent choice, meeting both EN 1078 and CPSC safety certifications. It features a second protective layer to improve impact absorption and a comprehensive adjustment system for a secure fit. The O'Neal Fidlock® magnetic buckle adds an extra layer of security and convenience.

The Rider

Focused on trail performance, this rider needs gear that won't hold them back. They look for a lightweight, well-ventilated helmet that provides comfort during long, demanding rides, allowing them to concentrate on navigating technical terrain in MTB, enduro, or all-mountain conditions.

With a weight of 400g (±25g) and optimized air circulation from its ventilation openings and internal channels, this helmet is built for performance. The height and width adjustment system ensures a comfortable, personalized fit, minimizing distractions during intense activity.

Competitive features

When choosing a helmet for all-mountain and enduro riding, key factors include safety, comfort, and specific features tailored to the demands of the trail. The O'Neal Defender Solid MTB Helmet is a strong contender in a competitive field, offering a blend of protection and trail-ready features. We'll compare it to other popular MTB helmets to help you determine if it's the right choice for your needs.

Where it excels

The O'Neal Defender Solid MTB Helmet stands out with its O'Neal Fidlock® magnetic buckle, a feature designed for quick and secure one-handed operation, which is a significant convenience on the trail. Engineered specifically for all-mountain and enduro disciplines, its design focuses on the specific protection and ventilation needs of these demanding riding styles, as highlighted by its double-inmold construction and optimized ventilation system.

Consider alternatives if...

While the Defender offers a comprehensive feature set for its intended use, riders seeking helmets with different protection technologies or those prioritizing other specific brand features might explore alternatives. The helmets in this comparison are all very closely matched in price, so the decision will likely come down to specific features like the Fidlock® buckle or brand preference.

Verdict

The O'Neal Defender Solid MTB Helmet is an excellent choice for its target audience of all-mountain and enduro riders. It delivers on key safety and convenience fronts with EN1078 certification and the user-friendly Fidlock® magnetic buckle. While its price is similar to competitors, its specific feature set makes it a compelling option for riders who value the convenience and dedicated design for aggressive trail riding.

Specs comparison

	Oneal Defender Solid MTB Helmet

Specs vs competitors

	Oneal Defender Solid MTB Helmet	One Trail Pro Mtb Helmet	Head Bike W19 Mtb Helmet	Leatt Mtb Allmtn 1.0 Mtb Helmet	Tsg Seek Solid Color Mtb Helmet	Leatt Trail 1.0 Mtb Helmet
Material	Outer Shell: 68% EPS, 32% Polycarbonate; Padding: 100% Polyurethane-Foam; Liner: 100% Polyester	Plastic	-	Polymer Compound shell	-	Synthetic
Ventilation	Ventilation Openings And Internal Ventilation Channels Ensure Optimized Air Circulation	Yes	-	Maximized ventilation with 14 vents effective even at low speeds	17 Aerodynamic Vents	14 Vents with MaxiFlow Air Channels
Fit System	height and width adjustment with adjustment wheel	360-degree adjustable retention system	Rear Dial-Adjustment System	Adjustable	Dial-Fit and Tuned Fit systems	Adjustable Fit System
Intended Use	MTB, Enduro, All-Mountain	All-Mountain	MTB	Cycling	MTB, Enduro, All-Mountain	all-mountain and trail riding
Closure System	O´Neal Fidlock® Magnetic Buckle	magnetic buckle	-	-	-	Retention System
Construction	Composite	Plastic	In-Mould	-	Low-Profile Design	In-Molded Design
Safety System	Second Layer Protecting Outer Edges And Improving Impact Absorption	-	-	-	Extended Rear Coverage	-
Adjustment System	comprehensive adjustment system with height and width adjustment wheel	precision-adjustable retention system	-	-	-	Adjustable Fit System
Padding	100% Polyurethane-Foam	Moisture-wicking	Soft, moisture-wicking pads	Moisture Wicking, Breathable, And Washable Inner Liner	-	Moisture-Wicking And Breathable Inner Liner