Arai Quantum-ST Pro Frosted Black Motorcycle Helmet

Infinity Price: £499.99 

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Arai Quantum-ST Pro Motorcycle Helmet:

Arai have made the Quantum-ST Pro to be ideal for experienced tour riders or sports riders. Using racing technology originally designed for the RX7 GP, Arai then made the Quantum-ST Pro more comfortable making it ideal for all day touring.

This helmet has been made with a unique ‘long oval’ shape that sets it apart from the standard shape of previous Arai helmets. This shape means a longer front-to back distance and a slightly smaller side-to side distance. This creates more space around the nose and mouth. This shape is also designed to not cause the painful forehead “hotspot” that some people suffer from. This helmet features Arai’s Pro Shade System that can either be locked as a sun peak or dropped down to act as a sun visor that is great at reducing glare from the sun.

But even with all these features to keep you comfortable the Quantum-ST Pro does not compromise your protection. Arai have made this helmet with their new SNC construction. This incorporates a structural net that reinforces the layers of the shell. This helps to make the helmet even more rigid for protection whilst also keeping it lightweight.

The Arai Quantum-ST Pro is made for people serious about riding. Whether all day touring or racing round the track the Quantum-ST Pro can handle it.


  • Arai’s patented SNC shell construction has a structural net to reinforce the shell layers for incredible protection
  • Multiple density EPS foam liner gives added shock absorption
  • Eco-Pure interior lining is removable and washable whilst also being anti-bacterial
  • Ventilation system designed to distribute fresh air evenly over the head whilst also exhausting old air through the rear vents
  • Pull down chin spoiler disrupts airflow at the base of the helmet and reduces wind noise
  • PRO Shade System (PSS) offers a combination of either a lockable sun peak or drop down sun visor to reduce glare from the sun
  • Arai Emergency Release System allows for quick and easy removal of the helmet in the event of a crash

All Arai Helmets we sell are official, UK supplied models with a 5 year warranty. We are Arai DNA dealers and all of our branches have trained staff who can advise with your Arai purchase.

The Arai Difference
You might be wondering why anyone would pay over 500 for an Arai helmet that meets the same standard as a 50 lid. It's a question we are asked in our branches practically every day. The answer is simply that "Arai Helmets are different!".

Different how?

From the off, Arai is not a corporation run by a board of directors who are only interested in profit. Arai is currently run by Akhito Arai, who took over from his father, Michio, who in turn took over from his father, Hirotake, the founder of Arai Helmets. Honour is important in Japanese culture, so the Arai family name on every helmet is a good indicator that there hasn't been any corner cutting!

In Europe, crash helmets need only pass CE-2205 to be deemed safe enough to be sold as protection. All Arai helmets pass this test, and any other test, worldwide. It's important to be clear that they don't just "meet" the required standards, Arai helmets exceed these standards.

Every Arai helmet is handmade and goes through three quality control departments, one after the shell is made, one after paint and graphics and another after assembly. When you have finished with your Arai, before you throw it away, take it apart and look inside the shell - there's a stamp in there, signed by everyone who worked on the helmet, so that quality control can be tracked through every step of manufacturing. Note that this quality control applies to every Arai, not every tenth or hundredth. This is part of the reason why Arai has offered a 5 Year Limited Warranty for the last 15 years. Arai were the first to offer comfort features like removable cheek pads, different interior shapes and liners in different thicknesses for a custom fit.

Arai are the only brand to have been ranked as number one in the J.D. Power Motorcycle Helmet Customer Satisfaction survey which is now in it's twelth year.

The bottom line is that wearing an Arai helmet will make you feel more comfortable and safer, for hours on end, day after day, long after a cheap helmet has got so uncomfortable and draughty that it has been replaced.

All branches of Infinity Motorcycles have staff who have been trained by Arai to help you buy the right helmet. We are also Arai Five Star dealers and service UK supplied Arai helmets, and we have a huge range of helmets in stock from other manufacturers so you can compare. If you would rather buy online, you can do so with confidence thanks to our 7 day helmet exchange policy.

Shop our full range of Arai Motorcycle Helmets

Delivery Costs.

To find the delivery costs for an item simply place the item in your basket. Our delivery costs for most items are based on each item's size and weight. Delivery and handling estimates that appear in the basket are calculated with our lowest cost delivery method.

Free Shipping on Orders Over £25

Orders to UK Mainland addresses over £25 (i.e. excluding Highlands and Islands) will be sent with free carriage.

Free Shippping To Other Destinations.

Orders will be shipped free of charge to areas other than the UK when the order total is over:
UK Highlands and Islands: £100
Europe Zone 1 - e.g. Eire, France, Germany £250
Europe Zone 2 - e.g. Greece, Poland £400
USA, Canada, Australia - £800
Items Shipped outwith the EU will include a form which can be used to claim back approx 10% V.A.T. Unfortunately this excludes BFPO addresses. Please note, V.A.T. is not applied to crash helmets.

Delivery Times

We aim to deliver UK Mainland orders in 3-5 working days, however if we have to place a supplier special order, delivery may be slightly longer. If the item ordered is out of stock we will contact you with the option to wait, choose an alternative or cancel the order.


Delivery of orders is by DPD or Royal Mail, all methods will require a signature for proof of receipt.

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