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Helmet | CX200 DS | CX101 | CX200 MX | Mode MX | Youth Mode MX |
Style | Dual-Sport | MX | MX | MX | Youth MX |
Shield Type | Clear Single-Lens | NA | NA | NA | NA |
Optional Single-Lens Shields | Smoke, Mirror Silver | NA | NA | NA | NA |
Available Snow Shields | Clear Dual-Lens & Electric | NA | NA | NA | NA |
Shell Material | Polycarbonate | Carbon Fiber | Polycarbonate | Polycarbonate | Polycarbonate |
Drop-Down Sun Visor | Smoke | NA | NA | NA | NA |
Speaker Pockets | Yes | No | No | No | No |
Sizes | X-Small - 3XL | Small - 3XL | Small - 3XL | Small - 3XL | Small - XL |
Warranty | 2 Year | 2 Year | 2 Year | 2 Year | 2 Year |
CX101 Carbon Ascent MX Helmet
Fit: True to Size
- Aggressive, modern design created with CAD technology
- 1250±50g 3K lightweight carbon fiber shell
- Multi-density EPS liner including placement in chin bar laterals
- Custom plush, removable & washable interior padding system
- Moisture-wicking, antibacterial, hypoallergenic interior
- Large eye port allows proper fit for modern goggles
- DOT & ECE Approved
- Double D-Ring chin strap retention system
- Advanced ventilation system allows massive airflow to remove heat & moisture
- Two Year Warranty
- Optional CX101 breath box sold separately
- Replacement CX101 Visors
- Replacement CX101 Visor Screws
- Replacement CX101 Mouth Vent
- Replacement CX101 Cheek Pads
- Replacement CX101 Liner
This sizing chart is simply a starting point. Head shapes vary - For the best fit, helmets should be fitted to you by an authorized Castle X dealer.
How To Measure:
For the most accurate sizing, have someone else take your measurements making sure the measuring tape is snug but not tight against your head.
Start Here:
Using a soft tape measure, start by measuring the circumference around your head at the temple, just above the eyebrow line (approximately one inch above the eyebrows).
Then select the helmet size that is closest to your head from the size chart.
For the most comfortable fit:
If your head measurement falls between two helmet sizes, try the larger of the two sizes.

Adult | X-Small | Small | Medium | Large | X-Large | 2X-Large | 3X-Large | 4X-Large | 5X-Large |
---|---|---|---|---|---|---|---|---|---|
Centimeters | 53-54 | 55-56 | 57-58 | 59-60 | 61-62 | 63-64 | 65-66 | 67-68 | 69-70 |
Hat Size | 6.5-6.75 | 6.75-7 | 7-7.25 | 7.25-7.5 | 7.5-7.75 | 7.75-8 | 8-8.25 | 8.25-8.5 | 8.5-8.75 |
Inches | 20.75-21.25 | 21.5-22 | 22.5-22.75 | 23.25-23.5 | 24-24.5 | 24.75-25.25 | 25.5-26 | 26.25-26.75 | 27.25-27.5 |
Note: For the most comfortable fit: If your head measurement falls between two helmet sizes, try the larger of the two sizes.