The next evolotion of the popular ST model, with increased comfort and practicality. The Quantum-ST Pro is a premium sports-touring helmet, ideal for all day touring riding. The helmet comes with a Pro Shade visor fitted as standard and integrated cheek pad pockets to allow the easy fitting of communication systems.
Out of stock
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Arai Helmets
S / M / L
Circumference (cm)
XS
53 - 54
S
55 - 56
M
57 - 58
L
59 - 60
XL
61 - 62
2XL
63 - 64
How to Measure
To find the right helmet size, measure all the way round your head at the widest point. Keep the tape measure above your ears and make sure that the tape measure is not too tight, nor too loose. Take your measurement in centimeters (cm), not inches.
Checking for Best Fit
When a new helmet is first worn, it should actually be slightly tight, with the interior coming into contact with most of the head, but not so restrictive that it causes any pain. There should be no "hot spots" - places where the helmet's interior puts pressure on specific points of the skull or face - but it should not move around freely. With time, a helmet will adjust to match the shape of the rider's head as it is worn and goes through "break-in" and loosens up a little. However, it should never become loose enough to easily turn from side to side.
Put the helmet on - it should be a little tight as it goes on over the head
The helmet should sit on the head evenly with the eye port's upper edge sitting just above the eyebrows and have good peripheral vision available to see side-to-side
Try putting a finger between the helmet interior and the head. If it easily fits, a smaller size should be tried next. Note that some helmet models allow for the cheek pads to be changed out for better fitment, so consider this too when checking for proper sizing
The new Quantum-ST Pro features the ‘’long oval’’ head shape. This specific shape offers a longer front-to back distance and a slightly smaller side-to- side distance compared with the standard Arai head shape. This shape offers new levels comfort for many European riders, who will experience that the Quantum-ST Pro will fit them perfectly. The Quantum-ST Pro is acknowledged as the premium sports- touring helmet, preferred by experienced touring and sports riders alike. The new Quantum- ST Pro edition enhances the strong features of the ST model even further: standard Pro Shade System visor fitted, even more room around the mouth and nose and integrated speaker pockets in the cheek pads for a communication system. Also exclusive to the Pro version is the new ‘’Ecopure’’ lining material offering new levels of comfort. The Quantum-ST Pro combines racing RX-7 GP technology with the comfort level needed for all day long touring riding.
To find the right helmet size, measure all the way round your head at the widest point. Keep the tape measure above your ears and make sure that the tape measure is not too tight, nor too loose. Take your measurement in centimeters (cm), not inches.
Checking for Best Fit
When a new helmet is first worn, it should actually be slightly tight, with the interior coming into contact with most of the head, but not so restrictive that it causes any pain. There should be no "hot spots" - places where the helmet's interior puts pressure on specific points of the skull or face - but it should not move around freely. With time, a helmet will adjust to match the shape of the rider's head as it is worn and goes through "break-in" and loosens up a little. However, it should never become loose enough to easily turn from side to side.
Put the helmet on - it should be a little tight as it goes on over the head
The helmet should sit on the head evenly with the eye port's upper edge sitting just above the eyebrows and have good peripheral vision available to see side-to-side
Try putting a finger between the helmet interior and the head. If it easily fits, a smaller size should be tried next. Note that some helmet models allow for the cheek pads to be changed out for better fitment, so consider this too when checking for proper sizing
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