6D ATR-1 Apex Helmet
Features Shell – A proprietary woven blend of advanced aerospace carbon fiber, and composite fiberglass Omni-Directional Suspension® (ODS®) technology Air Flow Management – 8 intake ports, 13 transfer ports, and... Read More
Features
- Shell – A proprietary woven blend of advanced aerospace carbon fiber, and composite fiberglass
- Omni-Directional Suspension® (ODS®) technology
- Air Flow Management – 8 intake ports, 13 transfer ports, and 4 aggressive exhaust ports
- Comfort Liner – Genuine CoolMax™ anti-bacterial fabric
- Emergency release cheek pads
- Rear Delta-Vent – Aids heat transfer by scavenging air
- Shear-away visor screws
- Roost Guard – Provides additional face protection
- Sternum Pad – Provides added protection of the chin, jaw and sternum
- Clavicle Cut-Away – Provides increased clavicle clearance
How to measure
Use a soft tape measure to measure horizontally around your head, approximately one inch above your eyebrows and half an inch above each ear. Cross-check the measurement against the size chart and choose the closest match — if you fall between sizes, try the smaller size first. Cheek pads should offer firm support against your cheekbones; 6D offers OEM cheek pad options for a customized fit.
Off-Road (ATR-1 / ATR-2 / ATR-3)
| 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 3/4 |
| L | 58-59 | 22 3/4 - 23 1/4 |
| XL | 60-61 | 23 5/8 - 24 |
| 2XL | 62-63 | 24 7/16 - 24 3/4 |
Street (ATS-1R)
| 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 3/4 |
| L | 59-60 | 22 3/4 - 23 1/4 |
| XL | 61-62 | 23 5/8 - 24 |
| 2XL | 62-63 | 24 7/16 - 24 3/4 |
Youth sizes
| Size | Head circumference (cm) | Head circumference (inches) |
|---|---|---|
| YS | 49-50 | 19 1/4 - 19 5/8 |
| YM | 50-51 | 19 5/8 - 20 |
| YL | 51-52 | 20 - 20 1/2 |
| YXL | 52-53 | 20 1/2 - 20 7/8 |
Two adult charts: 6D publishes per-model charts, but ATR-1/ATR-2/ATR-3 (off-road) are identical, as are the youth ATR-2Y/ATR-3Y. Street ATS-1R differs from off-road at L (59-60 cm vs 58-59) and XL (61-62 vs 60-61). 6D labels the largest size XXL and street sizes ATS-XS…ATS-XXL — normalized to our filter vocabulary (2XL, plain sizes). Verbatim manufacturer values; note 6D's own ATS-1R inch column for L (22 3/4 - 23 1/4) reads low relative to its cm range — values recorded as published.
Manufacturer sizing data · verified July 13, 2026