MTHELMETS Thunder 4 SV Full Face Motorcycle Helmet

Motorcycle helmet with red and black design on a white background

Black and red motorcycle helmet with clear visor on a white background

Black, red, and white motorcycle helmet with visible branding on a white background

Black, red, and white helmet with visible branding on a white background

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MTHELMETS Thunder 4 SV Full Face Motorcycle Helmet

MTHELMETS Thunder 4 SV Full Face Motorcycle Helmet

Name: MTHELMETS Thunder 4 SV Full Face Motorcycle Helmet
Brand: Lane ProMotor
SKU: 191288010:-1#GLOSS EXA RED;200329261:-1#S
Price: 459.00 AUD
Availability: InStock

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$459.00

$599.00

GLOSS EXA RED

S(55–56cm)
M(57–58cm)
L(59–60cm)
XL(61–62cm)
XXL(63–64cm)
3XL(65–66cm)
4XL(67–68cm)

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📏 Riders, please review the Size Guide in the product description before selecting your size.

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MTHELMETS · THUNDER 4 SV · Full Face · ABS Shell · DOT + ECE + CCC · Unisex · S–4XL · 2.86kg · Guangdong

MTHELMETS Thunder 4 SV
Full Face Motorcycle
Helmet

DOT + ECE + CCC · ABS Shell · Clear Visor · Quick-Release · Polyester Lining · Unisex · S–4XL

The Thunder 4 SV shares the MTHELMETS platform — ABS shell, EPS liner, DOT/ECE/CCC triple certification, quick-release chin strap, clear visor, and polyester comfort lining — and extends it with one additional size step: 4XL at 67–68cm head circumference, which the JARAMA (S–3XL) does not offer. Riders at the upper end of the size range who cannot find a certified full-face at 4XL will find the Thunder 4 SV's extra size meaningful. OEM and ODM production are supported across all seven sizes.

● DOT + ECE + CCC ABS Shell Full Face Clear Visor Quick-Release Polyester Lining All-Season Unisex S – 4XL

DOT / ECE / CCC

ABS Shell

Full Face

Quick Release

Clear Visor

Comfort Lining

All-Season

Unisex Fit

Thunder 4 SV vs JARAMA — Key Differences

📐

4XL Size — 67–68cm

The Thunder 4 SV's defining difference from the JARAMA is the 4XL size: 67–68cm head circumference. The JARAMA tops out at 3XL (65–66cm). Full-face helmets in certified construction at 4XL are uncommon at accessible price points — riders who measure 67–68cm and have struggled to find a DOT/ECE/CCC certified full-face will find the Thunder 4 SV's 4XL specifically addresses this gap.

📦

Larger Package — 44 × 31 × 33 cm

The Thunder 4 SV ships in a 44 × 31 × 33 cm package at 2.86 kg gross, compared to the JARAMA's 39 × 30.5 × 32 cm at 2.505 kg. The additional package volume and weight accommodate the larger shell geometry required to produce the 3XL and 4XL sizes. The actual helmet weight is considerably lower than the gross packaging weight.

🪖

Shared Construction — ABS Shell + EPS

The Thunder 4 SV uses the same core construction as the JARAMA: injection-moulded ABS outer shell distributes impact force to the EPS liner beneath. The ABS shell must remain structurally intact to perform its load-spreading function — a crack after any significant impact, even invisible against the painted surface, eliminates this. Replace after any crash regardless of appearance.

🏅

Same Triple Certification

DOT (US self-declaration), ECE R22 (pre-market independent laboratory testing), and CCC (China mandatory pre-market testing). The ECE certification is the most meaningful for independent verification — it requires a third-party lab to test impact attenuation, retention, and field-of-view before the helmet reaches the market. Riders in ECE-regulated markets benefit most from this certification. All three apply to both the JARAMA and the Thunder 4 SV.

⚡

Quick-Release + Clear Visor

Quick-release allows gloved operation without D-ring threading — confirm the buckle click-locks fully before every ride. Emergency responders use the quick-release to remove the helmet without rotating it, critical if spinal injury is suspected. The clear visor provides full light transmission across all conditions; the visor's perimeter gasket is the primary source of wind noise if it hardens with age — inspect annually and replace if it has lost compression at any point.

📏

Seven Sizes — S to 4XL

The Thunder 4 SV covers seven sizes from S (55–56cm) to 4XL (67–68cm). At the upper end, head shape variation is more pronounced than at medium sizes — a 67cm oval skull and a 67cm round skull both measure 4XL but may not fit the same EPS mould equally well. Measure circumference at the widest skull point three times and use the largest reading. Confirm the EPS sits without persistent local pressure before the return window closes.

Key Highlights

No. 1
4XL Certified Full-Face — Why It Matters
Most certified full-face helmets from mainstream brands cap at XL or XXL (61–64cm). The 3XL–4XL range at 65–68cm is underserved — riders who measure in this range often compromise on certification level, helmet type, or both. The Thunder 4 SV's DOT/ECE/CCC certification at 4XL means riders at 67–68cm do not have to accept an uncertified helmet or an open-face design simply due to size availability. If the JARAMA covers your head circumference at S–3XL, the Thunder 4 SV offers no additional advantage over it.
No. 2
Fit at Large Sizes — Measure Three Times
At the 3XL and 4XL sizes (65–68cm), head shape variation is more pronounced than at medium sizes — oval, round, and intermediate head profiles all exist in this circumference range. The Thunder 4 SV's EPS mould may fit some 66cm skulls comfortably and others not, even at the same circumference. Measure at the widest skull point (above eyebrows, over ears, around the occipital protrusion at the rear) three times and use the largest reading. At 3XL/4XL especially, confirm the EPS shape fits your skull without persistent local pressure points before committing to the size.
No. 3
Correct Fit — Snug and Even, Not Comfortable
A correctly fitted helmet feels firm and applies even pressure around the skull with no gaps between EPS and skull. If it feels comfortable immediately, it is almost certainly too large — the liner has not compressed to fill the space and the EPS is not in full contact with the skull. An oversized helmet rotates in a crash, exposing unprotected areas at impact. Specific pressure points that persist beyond 20 minutes indicate a head-shape mismatch for this mould — the solution is a different model, not a larger size.
No. 4
Visor Lock and Chin Strap — Pre-Ride Checks
Before every highway ride: close the visor and apply upward hand pressure — if it moves, the lock is not engaged and the visor can open aerodynamically at speed with no recovery time. Check the chin strap two-finger gap — two fingers between strap underside and chin. Three fingers or more allows the helmet to rotate forward under frontal impact. One finger or less restricts blood flow. The gap setting changes with different jacket collar heights, so recheck when changing riding gear.
No. 5
Replace After Any Crash or Hard Drop
ABS shell internal fractures and EPS liner cellular crush both occur without visible external evidence. A drop from handlebar height onto concrete or a crash at any riding speed is sufficient to compromise both layers. The triple certification (DOT, ECE, CCC) applies to a new, unimpacted helmet. After any significant impact, the helmet provides unknown and likely reduced protection — replace before riding again. This applies equally to the Thunder 4 SV and JARAMA.
No. 6
Helmet Lifespan — 5 Years from Manufacture
Replace every 5 years regardless of crash history: ABS brittleness increases with UV exposure over time, EPS cellular structure gradually hardens reducing energy absorption compliance, and skin oils in the comfort lining degrade adhesive bonds to the EPS. Helmets used in regular sun and outdoor conditions age faster than infrequently used ones. The manufacture date (typically on an internal label) is the reference date, not the purchase date. At 3XL and 4XL, replacement options may be more limited — identify a replacement model before the current helmet's service life expires.

Construction Zone Detail

ABS Shell — Post-Impact Inspection

Run fingers across the shell surface under direct bright light after any impact — micro-cracks read as texture differences the eye misses against the painted surface. Focus on the crown, forehead, and chin bar: the three primary contact points in forward falls. Even if the surface appears intact, a significant impact transfers energy to the EPS beneath, which may have permanently deformed. Shell surface inspection is insufficient — the EPS condition after any crash is the critical unknown that makes replacement mandatory.

EPS Liner — Variable Density

The EPS liner uses different foam densities at different zones — higher at the crown and forehead where impact energy is greatest, lower at the temples. This calibration is specific to the Thunder 4 SV's ABS shell geometry and size-specific mould. At 3XL and 4XL, the liner is dimensionally larger but should maintain the same density zone distribution. Replacing the liner with a generic EPS insert would alter energy transfer characteristics even if dimensions matched — use OEM-specified components only.

Visor Gasket — Annual Inspection

Press the perimeter gasket firmly along its full length at the start of each riding season. Sections that feel significantly harder or show visible flattening have lost compression recovery and will allow wind ingress at the seal line — the primary source of highway wind noise in full-face helmets. Replace hardened or deformed sections before winter riding. At the chin bar and crown corners where the gasket turns, deformation is most likely to occur first from repeated visor opening and closing cycles.

Quick-Release Buckle — Monthly Retention Check

Fasten the buckle, grip both strap ends below it, and apply firm pull force. If the buckle releases without the deliberate tab press, the internal spring has fatigued. A fatigued buckle that appears correctly fastened can release under crash deceleration, removing chin strap retention at the moment of maximum need. Replace the buckle before riding if this test fails. At 3XL and 4XL where the strap must accommodate a larger neck circumference, the strap adjustment should be rechecked whenever the helmet is used by a different rider.

Comfort Lining — Washing

If the lining is removable, wash cold on a delicate cycle and air dry. A moisture-saturated EPS liner (from submerging the complete helmet during washing) softens temporarily and provides reduced energy absorption until fully dry. Tumble drying degrades polyester fibre and dimensional accuracy. If the lining is not removable, wipe accessible surfaces with a damp cloth only. Lining compression from accumulated sweat and oils changes the effective internal diameter — wash regularly to maintain the fit geometry the helmet was sized for.

Large-Size Storage and Replacement Planning

At 3XL and 4XL (65–68cm), the Thunder 4 SV's shell is physically larger and heavier than smaller sizes. Store it on a stand or suspended by the chin bar — storing a large helmet compressed against a shelf surface or in a bag where the shell rests unevenly over extended periods can deform the EPS liner at the contact point. More practically: at the 5-year replacement point, confirmed certified full-face helmets at 4XL may not be as readily available as they are today. Identify a replacement model before the current helmet reaches the end of its service life.

Key Attributes

Certification

DOT + ECE + CCC

Shell

ABS Injection Moulded

Visor

Clear

Closure

Quick-Release

Size Range

S – 4XL

Weight (Gross)

2.86 kg

Choose the Thunder 4 SV over the JARAMA only if you need 4XL (67–68cm): The JARAMA runs S–3XL (55–66cm) in a 39 × 30.5 × 32 cm package at 2.505 kg gross. The Thunder 4 SV adds the 4XL size at 44 × 31 × 33 cm / 2.86 kg gross. At S–3XL the two models share the same construction and certifications — there is no technical advantage between them below 3XL size.
Measure at the widest skull point, three times, use the largest reading: Above the eyebrows, over the ears, around the occipital protrusion at the rear. At 3XL and 4XL, head shape variation is more pronounced — a circumference of 67cm on a round skull may fit 4XL while the same circumference on a more oval skull may not. If between sizes, choose the larger — the liner conforms over the first 15–20 hours of use.
Firm all-round pressure is correct — comfortable immediately means too large: The EPS must contact the skull evenly with no gaps. A helmet that feels comfortable on first wear is almost certainly one size too large. Local pressure points that persist after 20 minutes indicate an EPS shape mismatch for this rider's skull anatomy — size up will not fix this; try a different model.
Plan replacement before the 5-year mark — 4XL availability varies: The Thunder 4 SV's 5-year service life ends at a date when 4XL certified full-face options may be more or less available than today. Identify a replacement model before the current helmet's service life expires, particularly at 3XL and 4XL where confirmed certified options are fewer than at standard sizes.

Helmet Size Chart

Measure head circumference above the eyebrows, over the ears, and around the occipital protrusion. Take three measurements, use the largest. If between sizes, choose the larger. At 3XL and 4XL, head shape matters as much as circumference — confirm the EPS fits your skull shape without persistent local pressure before the return window closes.

Size	Head Circumference (cm)
S	55 – 56
M	57 – 58
L	59 – 60
XL	61 – 62
XXL	63 – 64
3XL	65 – 66
4XL	67 – 68

* Seven sizes from S to 4XL. 4XL (67–68cm) is the Thunder 4 SV's additional size vs the JARAMA (S–3XL). If your measurement falls at the upper boundary of a size, choose the next size up.

Product Specifications

BrandMTHELMETS

ModelTHUNDER 4 SV

TypeFull Face Motorcycle Helmet

ShellABS (Injection Moulded)

Inner LiningPolyester Comfort Liner

VisorClear

ClosureQuick-Release Buckle

CertificationsDOT / ECE R22 / CCC

DesignPlain / Modern

SeasonAll-Season

GenderUnisex

ApplicationStreet / Touring / Racing / Off-Road

Size RangeS, M, L, XL, XXL, 3XL, 4XL

Package44 × 31 × 33 cm · 2.86 kg gross

OriginGuangdong, China

ConditionBrand New

Package Includes

🪖1 × MTHELMETS Thunder 4 SV Full Face Helmet

📦Secure Packaging · 44 × 31 × 33 cm

MTHELMETS Thunder 4 SV — triple certified full-face, S to 4XL. ABS shell, EPS liner, DOT/ECE/CCC certified, clear visor, quick-release strap, polyester lining. The MTHELMETS full-face option for riders who need 4XL (67–68cm).

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Many of our items meet the CE AAA standard—the highest level of safety certification for motorcycle apparel. Whether you’re cruising the streets, hitting the track, or powering through off-road terrain, Lane ProMotor gear is built to perform wherever the ride leads.

Once your order is on its way, you’ll receive your tracking number by email within 2–3 business days. Enter it on our Track Your Order page for live delivery updates. If it hasn’t come through after a week, check your spam or let us know and we’ll resend it.

Feel free to email us anytime at info@lanepromotor.com. Our support team is available Monday–Friday from 09:00 to 17:00 (Perth time, GMT+8). We aim to respond within 24 hours, excluding weekends and public holidays.

Please notify us immediately so we can correct the address before your order is dispatched. If the parcel is returned to us, a restocking or reshipment fee may apply. Be sure to double-check your address at checkout to avoid any delays.

All our gear is brand-new, in excellent, unworn condition. While minor storage marks may occasionally occur, every item is thoroughly inspected before we ship it out. Lane ProMotor delivers motorcycle equipment that won’t fade, crack or give in. From gloves and helmets to vests, pants, and custom race suits, each product is engineered to handle impact and endure tough riding conditions.

Returns & Exchanges Policy

At Lane ProMotor™, we are committed to providing riders with premium motorcycle gear, apparel, and accessories backed by excellent customer service. We understand that sometimes things do not work out, which is why we aim to make the return and exchange process as simple and hassle-free as possible.

30-Day Free Return Policy

Lane ProMotor™ offers a 30-day return policy, allowing you to request a return within 30 days of receiving your item.

To be eligible for a return, your item must:

Be unworn, unused, and in original condition
Include all original tags and packaging
Be accompanied by proof of purchase or order confirmation

To start a return, please contact us at 📧 info@lanepromotor.com.

Once your return request is approved, we will provide return instructions and the appropriate return address. Returns sent without prior approval will not be accepted.

How To Initiate A Return Or Exchange

To request a return or exchange, please follow these steps:

Contact our support team at info@lanepromotor.com
Provide your order number and reason for the return or exchange
Wait for approval and return instructions
Securely package your item in its original packaging
Ship the item according to the provided instructions

Please ensure your order number is included inside the parcel to avoid delays.

Damages & Issues

Please inspect your order immediately upon delivery.

If your item arrives damaged, defective, incorrect, or missing parts, please contact us as soon as possible at info@lanepromotor.com with:

Your order number
Photos of the item and packaging
A brief explanation of the issue

We will review the matter promptly and work to provide an appropriate resolution.

Exceptions / Non-Returnable Items

The following items are not eligible for return or exchange:

Sale or clearance items
Gift cards
Custom or personalised products
Perishable goods
Personal care products
Hazardous materials
Final sale items

If you are unsure whether your item qualifies for a return, please contact us before sending it back.

Return Shipping Costs

Domestic Returns (Australia)
Customers are responsible for return shipping costs unless the item arrived damaged, defective, or incorrect.

International Returns
International customers are responsible for all return shipping costs, customs duties, taxes, and associated return fees.

Exchanges
If an exchange is approved due to a sizing issue, damaged item, or incorrect product, Lane ProMotor™ may cover the shipping cost for sending the replacement item depending on the circumstance.

Exchanges

Need a different size, colour, or product?

The fastest way to receive a replacement item is to:

Submit a return request for the original item
Return the approved item
Place a new order for your preferred replacement product

If you require assistance with sizing or exchanges, our support team is happy to help.

Refunds

Once we receive and inspect your returned item, we will notify you regarding the approval status of your refund.

If approved:

Refunds will be issued to your original payment method
Processing generally takes 5–7 business days
Your bank or payment provider may require an additional 24–48 hours to process the refund

If more than 15 business days have passed since your refund was approved, please contact us at info@lanepromotor.com.

European Union – 14-Day Cooling-Off Period

For customers located in the European Union, you have the right to cancel or return your order within 14 days for any reason and without justification.

To qualify:

Items must be unused and in original condition
All tags and packaging must be included
Proof of purchase is required

Frequently Asked Questions (FAQ)

How long does it take to process my return?
Returns are usually processed within 5–7 business days after the returned item has been received and inspected.

Can sale items be returned?
Sale and clearance items are generally final sale unless faulty under applicable consumer laws.

Can I exchange for another size?
Yes. Please contact our support team before returning your item so we can assist you with the exchange process.

What if I entered the wrong shipping address?
Please contact us immediately. Once an order has been dispatched, address changes may no longer be possible.

Do you provide prepaid return labels?
Prepaid return labels may be provided for approved eligible returns depending on the situation.

Need Help?

If you have any questions regarding your order, return, exchange, or refund, please contact our support team:

📧 info@lanepromotor.com

Business Hours:
Monday – Friday, 9:00am – 5:00pm AWST

Lane ProMotor™ Support Team

Yes, we offer exchanges for unworn items that still have their original tags and packaging. Simply email us at info@lanepromotor.com and let us know which size or style you’d like.

MTHELMETS Thunder 4 SV Full Face Motorcycle Helmet

MTHELMETS Thunder 4 SV
Full Face Motorcycle
Helmet

FAQ

Returns & Exchanges Policy

30-Day Free Return Policy

How To Initiate A Return Or Exchange

Damages & Issues

Exceptions / Non-Returnable Items

Return Shipping Costs

Exchanges

Refunds

European Union – 14-Day Cooling-Off Period

Frequently Asked Questions (FAQ)

Need Help?

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Your Cart

MTHELMETS Thunder 4 SV Full Face Motorcycle Helmet

MTHELMETS Thunder 4 SVFull Face MotorcycleHelmet

FAQ

Returns & Exchanges Policy

30-Day Free Return Policy

How To Initiate A Return Or Exchange

Damages & Issues

Exceptions / Non-Returnable Items

Return Shipping Costs

Exchanges

Refunds

European Union – 14-Day Cooling-Off Period

Frequently Asked Questions (FAQ)

Need Help?

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MTHELMETS Thunder 4 SV
Full Face Motorcycle
Helmet