Arai VX-Pro4 Helmet
Features Features intermediate oval shape which fits the majority of head shapes in the North American markets Consistently round and smooth shell, maintaining Glancing Off shape concept Rounded chin bar... Read More
Features
- Features intermediate oval shape which fits the majority of head shapes in the North American markets
- Consistently round and smooth shell, maintaining Glancing Off shape concept
- Rounded chin bar maintains compact shell length resulting in less protrusion, leaving it less likely to catch and dig during a spill
- Super Fiber provides 30% higher tensile strength than standard fiberglass and provides increased penetration resistance
- Peripherally Belted Complex Laminate Construction (PB-CLC) shell
- Chin bar vent grill installed on a rounded chin bar, mounted form the outside on the exterior vent cap and can be easily removed for cleaning or damage replacement—vent cap also designed to break way from the chin bar in event of impact
- The Air-Through top-rear-duct center brace also functions as a goggle-strap locator
- Diffusers can be removed or replaced quickly and easily by removing a single screw on the rear-duct center brace
- Air outlets on the peak are made larger to compensate for increased lift and is made with durable, yet extremely flexible material, mounted with plastic screws designed to break on impact, so as to not snag on impact which could send energy into the helmet or cause excess rotational force
- Emergency release cheek pad design allows trained medical personnel easier access to an injured rider, reducing the chance of unintentional injury
- Removable neck roll allows easy and convenient cleaning of the helmet
How to measure
Measure the circumference of your head in cm across the forehead, above the eyes and ears and over the small bump at the back of the head — read the size where the tape joins. Focus on head size (crown fit) first, then fine-tune with cheek pads. Arai stresses the chart is a STARTING POINT: the best fit comes from trying on Arai's different interior fit shapes.
Arai Helmets size chart
| Size | Head circumference (cm) | Head circumference (inches) |
|---|---|---|
| XS | 53-54 | 20 7/8 - 21 1/4 |
| S | 55-56 | 21 5/8 - 22 |
| M | 57-58 | 22 1/2 - 22 7/8 |
| L | 59-60 | 23 1/4 - 23 5/8 |
| XL | 61-62 | 24 - 24 3/8 |
| 2XL | 63-64 | 24 3/4 - 25 1/4 |
| 3XL | 65-66 | 25 5/8 - 26 |
One head-circumference chart covers all current Arai models — what differs per model is interior SHAPE, not size: Intermediate Oval (Corsair-X, Contour-X, Defiant-X, Regent-X, XD-4/XD-5, VX-Pro4 — fits most North American heads), Round Oval (Quantum-X), Long Oval (Signet-X). Try the shape that matches your head. Not every model runs every size (e.g. Corsair-X standard range XS–2XL). Arai publishes CM ONLY on every official arm — inch values here are exact conversions (×2.54, nearest 1/8″), not manufacturer-printed; retailer inch charts differ because they round differently. Labels normalized (XXL/XXXL → 2XL/3XL). Extreme sizes (3XS 49-50, 2XS 51-52) are select-model/special-order and not on the current chart. No youth motorcycle chart exists (the CK-6 is a karting helmet). Verified from araiamericas.com chart image + whyarai.co.uk 2026-07-13.
Manufacturer sizing data · verified July 13, 2026