AT4.0 CARBON

Jormungandr - Blemished

£212.50 £425.00
3509 reviews
Rated 4.5 out of 5 stars
5 stars (2716)
4 stars (324)
3 stars (161)
2 stars (100)
1 star (208)
 
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 UK Headquarters
  • FREE SHIPPING over £80 via tracked courier
  • FREE RETURNS
  • FREE EXCHANGES
  • UK Mainland: next-day-delivery from dispatch*
*Scottish Highlands can take up to 2 days from dispatch.
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 system 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.

It looks like you're based in
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
3,509 verified reviews
5 77%
4 9%
3 5%
2 3%
1 6%
What riders love
Style5.0 / 5.0
Comfort4.8 / 5.0
Features4.6 / 5.0
Tech4.8 / 5.0
What riders say
FitRuns smallRuns large
WeightLightHeavy
VisionNarrowWide
Noise levelQuietLoud
Verified reviews Showing 20 of 3,201
Barry HeapOctober 4 2026
Great helmet no issues
Lars WielersOctober 2 2026
The helmet is of very high quality and comfortable to wear; the hands-free system is great. I like it!
Mickael SouffleurOctober 1 2026
La qualité
andrea robertoOctober 1 2026
Prodotto molto valido, comodo ben ventilato, ottima visibilità anche con la visiera scura e abbastanza silenzioso
Jonathan MarinoSeptember 30 2026
Cool design, feels great on. Wide field of view. Really happy with this product.
Adrian RothSeptember 30 2026
Excellent quality, awesome looks— simply fantastic!
MichaelSeptember 30 2026
Its a lovely looking helmet and get alot of head turns from other cars
Gianpaolo ArmandiSeptember 29 2026
Prodotto cambiato in garanzia , nulla da dire di negativo , l'assistenza è stata ottima
Wolf AndreasSeptember 29 2026
Toller Helm
Christoph BlatterSeptember 29 2026
Super Helm sitz perfekt. Größe hab ich L genommen. Bei anderen Herstellern hatte ich sonst immer M. Sieht einfach brutal aus 😃
stephenwicksSeptember 28 2026
love the way it look great on my harley davidson vrod
Károly BudaiSeptember 25 2026
Legjobb sisak! Minőség magáért beszél!
Ricardo TeixeiraSeptember 23 2026
Very light, fits perfectly and it's very comfortable. The design is colorful and the fact of bringing a dark lent included was the cherry on top of the cake
Andrea de Canussio September 21 2026
Wow fatto bene
Jayson ZunigaSeptember 21 2026
helmet feels very lightweight and comfortable fit.
JACK SANDVIGSeptember 21 2026
Snug, you can feel the quality in the helmet, and i will be buying the photocromatic visor next, the Liner is a pain to take out to get the shockwave installed, but its maneagable
Frédéric LOUVIOTSeptember 21 2026
Excellent produit. Taille bien si on respecte les consignes du site. Je recommande
JuanSeptember 20 2026
Really comfortable and with amazing quality
Raven WilliamsSeptember 20 2026
It fits perfectly
DanSeptember 19 2026
Amazing helmet, just wow