AT4.0 CARBON

Jormungandr - Blemished

$274.50 $549.00
3438 reviews
Rated 4.5 out of 5 stars
5 stars (2656)
4 stars (319)
3 stars (161)
2 stars (96)
1 star (206)
 
Specs & Description

Discarded into the great ocean, Jormungandr grew to become the colossal venomous world serpent, wrapping itself around Earth and tightly grasping its own tail. Once this bond is broken, Ragnarok is inevitable, with thunderously violent unrest at sea and skies filled with poison, doomsday will descend. The ATLAS 4.0 Jormungandr full face motorcycle helmet is packed with leviathan's razor-sharp teeth, wrapped in scaled armour etched with runic lettering on a stunning decal that spans the new re-engineered ATLAS 4.0 shell. The ATLAS 4.0 Jormungandr motorcycle helmet with its savage decal rocks an impressive safety standard of ECE 22.06. New fresh cheek pads with tailor-made sweat-wicking premium fabric containing multi-layered multi-density foam for smart contouring of the rider’s face give the ATLAS 4.0 Jormungandr a premium feel and greater comfort. The streamlined shell has open and close vents on the top and the front with 4 vent positions to increase climate control possibilities in hot and cold environments. Sound dampening inserts and less air resistance on the shell give the rider quieter acoustics when travelling at speed. The new headliner packs in RHEON™ technology providing Ruroc 4.0 motorcycle riders with extra protection from linear impact and rotational forces applied to their head, this is done using reactive polymers which have non-Newtonian fluid properties. 

 

The ATLAS 4.0 is Ruroc’s quietest motorcycle helmet ever but why not improve the functionality and entertainment and upgrade it to a Bluetooth motorcycle helmet with our Shockwave™ Bluetooth insert (sold separately). The ATLAS Shockwave™ is easily installed with a seamless fit into the rear of your helmet. The ATLAS Shockwave™ now has a 60% smaller mic and low-profile speakers that deliver high-quality audio with rich bass for 8 hours of playtime with a USB-C rechargeable battery.

The ATLAS 4.0 Jormungandr can be transformed and customised with our wide range of helmet visors. We offer 7 additional coloured visors that are easily changeable with our quick release thumbscrews. The helmet comes with a pre-installed clear visor for road use and a secondary tinted visor for track use only. All our visors are compatible with Pinlock® inserts that can easily be installed for anti-fog protection (available separately).

Delivery & Returns
  • Delivered in custom protective packaging from our US depot*
  • FREE SHIPPING over $100 via tracked courier
  • FREE RETURNS
  • FREE EXCHANGES
  • Mainland US: up to 5 days from dispatch
  • Alaska & Hawaii: up to 7 days from dispatch
*Orders to Puerto Rico ship internationally from our UK depot. Some spare parts may also ship from the UK.
Helmet with DOT and ECE certification
DOT Certified
ECE 22.06 Certified

Seal of Approval.

AT4.0 CARBON is engineered for safety performance, exceeding ECE 22.06 requirements by a minimum of 20%, and carrying DOT approval and a SHARP 4-star rating.

Helmet interior padding

Ultimate Comfort

The fully re-engineered internals, including head-liner and cheek pads, take fit, comfort, acoustic control and support to a whole new level.

RHEON™ Protection

The world’s first road-ready motorcycle helmet to feature RHEON™ technology. Next-level protection seamlessly integrated into the AT4.0 head-liner.

Shockwave Bluetooth audio system
Bluetooth

Protection Meets Connection

AT4.0 CARBON is compatible with the Shockwave Bluetooth audio system. Featuring seamless helmet integration, the Harman Kardon designed and tuned unit delivers rich & crisp audio.

215 degree field of view

Maximum Vision

Featuring 215° horizontal and 100° vertical field of vision, the AT4.0 edge-to edge visor maximises peripheral vision. Anti-scratch dipped, Pinlock 70 compatible, and made from Optical Grade Ballistic Polycarbonate, this is vision reinforced.

Helmet ventilation system

Full Climate Control.

Take full control of your helmet environment with open/close vents & tune your thermal comfort in both warm and cool climates.

FAQs

How do I know what size AT4.0 CARBON motorcycle helmet to get?

Take a fabric measuring tape, wrap it around your head just above your eyebrows and ears. Pull the tape until comfortably tight. Take the measurement. Our motorcycle helmet fit is intermediate oval.

How tight should the AT4.0 CARBON motorcycle helmet be?

A helmet should feel snug, with even pressure around your crown and a firm cheek bite. Cheek pads bed in over time, so it shouldn't feel loose (or "perfect") straight away. There should be no helmet movement when turning from side to side. A snug fit is essential for safety.

Does carbon fiber perform better?

Carbon fiber delivers a perfect balance of light weight and superior impact absorbing characteristics, making it a great choice for motorcycle helmets.

What is RHEON™?

It's impact tech that hardens on crash impact, preventing injuries from linear and rotational impacts. Standard headliners can't do this. RHEON™ can.

What buckle does the AT4.0 CARBON motorcycle helmet use? Is it safe?

Fidlock. It's magnetic + mechanical. The magnet pulls the tab in. The mechanical lock holds it. To open, pull tab which will open the mechanism. Wind won't open it. Crashes won't open it. It's much quicker to use than a double D-ring and just as safe.

How do I clean the AT4.0 CARBON motorcycle helmet visor without scratching it?

Rinse the visor first, grit is the enemy. Use mild soap and a microfiber towel. Wipe off. For longlasting protection, order one of our Muc-Off Helmet Cleaning Kits.

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Find your size
We recommend:
How to measure
  1. With a fabric measuring tape, wrap it around your head just above your eyebrows and ears.
  2. Pull the tape comfortably tight. Take the measurement.

Our motorcycle and snow helmet fit is an intermediate oval.

Returns policy

If the fit is not quite right our return process is simple. 14 days to exchange, picked up from home. See our returns page for more details.

Reviews for AT4.0 Carbon Range

All reviews are from verified customers

4.5 /5
3438 Reviews
Matin KabiriJuly 28 2026
Fast shipping with the best quality, a fantastic carbon helmet with complete charm and beauty.
RobertJuly 28 2026
Best helmet I’ve ever owned
GiovannaJuly 27 2026
Stupendo dal vivo ancora meglio fa commuovere 😱😍🤩
KundeJuly 24 2026
Super schnelle Lieferung und super Service
steveo skinnerJuly 24 2026
Epic lid love it
Alessandro GattoJuly 24 2026
Great quality
Kalli ParsonsJuly 22 2026
Love super cute and durable
Robbie McmenaminJuly 21 2026
Looks great fits great light great air flow fits perfectly love my new helmet
Francesco RuccoJuly 21 2026
Casco bellissimo
Raphaël JacintoJuly 20 2026
Qualitatif
deciccodanilo deciccodaniloJuly 19 2026
Bellissimo da vedere, indossato è comodo e non è rumoroso come si dice. Con la mia Brutale si sposa bene 😊
Zackary MorrisJuly 18 2026
Marvelous
GuestJuly 18 2026
Only Windnoise is a Problem. Fits good, comfortable and high qaulity inlayer
AraaJuly 16 2026
Casque ok, mais les mousses de sécurité sont pas à retirer car une fois remise se détachent sans cesse (pour avoir mis mon propre intercom)
Kyle SheltonJuly 11 2026
Love this helmet, safe feel in side the helmet, lots of breathability. I wear glasses as well I have no issues with steaming up. Clasp is great easy to close and open. Design is great get a lot of looks on the road. Changing out visors is a pleasure. Good robust safe feel just what you need from your helmet. All round best helmet I have ever brought. Well done Rurok !
RhondaJuly 9 2026
Amazing fit and super comfortable will be buying more soon!
FabioJuly 8 2026
Best helmet i ever had beautiful slick and very confy to hear and the vision is amazing ,can see the world now!
J.ReverzJuly 7 2026
Love this helmet! Although the sizing chart is off, and I had to exchange for the next size larger.
Monica BivasJuly 7 2026
Beautiful, and confortable design.
Nuno CostaJuly 7 2026
In the future will buy more