21,503.85 PHP (55,954 JPY)
Delivery Information
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Size Chart For Helmet
How to measure the size of your head
First, measure the circumference of your head with a measuring tape.
Measure from the highest point of your forehead, just above your eyebrows, horizontally backwards to the highest point of the back of your head and around.
Based on the measurement, choose the size from the table below.
However, unlike hats, helmets cannot be sized by head circumference alone.
Also, helmets of the same manufacturer may feel different even if they are the same size depending on the model.

Ordering Size | XS | S | M | L | XL | 2XL |
Head Measurement (cm) | 53 - 54 cm | 55 - 56 cm | 57 - 58 cm | 59 - 60 cm | 61 - 62 cm | 63 - 64 cm |
* This universal size chart is for reference only. Sizes vary by manufacturer and product.
Product detail
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color MATTE GREY BLACK VIOLET
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color type graphic
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Helmet SG mark ×
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Helmet Standard JIS ×
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Helmet Standard SNELL ×
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Helmet Standard MFJ ×
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Helmet PSC mark ×
[Collar]MATTE GREY BLACK VIOLET
[Features]Fully structured shell by HPC (High performance Composite)
[Weight] 1400g (±50g)
**Do not use on public roads.
*If the instruction manual is included, it is in English.
*Please note that there are cases wherein the delivery date will be delayed because it is an imported product.
*Please note that the product specification may change due to manufacturer reasons.
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FULL FACE HELMET AIROH ST.501
Helmet approved in compliance with the European regulation ECE 22-05(Approval valid only in Europe)
ST.501 enhances the pleasure of driving and is the ideal companion for any journey.
With a tapered shell in HPC(High Performance Composite),a set of variable density EPS,the ventilation system that channels the air flows inside the shell and the large quick release visor allows you to have maximum control on every detail.
Always ready to seize every opportunity,ST.501 is Bluetooth-Ready,integrates the Sun Screen Visor system,Pinlock and Stop Wind included that make it ready to face the most demanding journeys.
Points of Attention
* The helmets sold on this site are based on the Japanese safety standard.
We are not responsible for accidents, damage, injury, or any other related matters as a result of purchasing this product.