The Thor Sector Split MIPS Helmet is a motocross and off-road helmet designed to combine lightweight protection, ventilation, and rider comfort. Its injection-molded polycarbonate/ABS shell, MIPS® safety system, EPS impact liner, adjustable visor, and removable moisture-wicking interior make it well suited for motocross, trail, ATV, and off-road riding.

• MIPS® safety system helps reduce rotational forces transmitted to the head during certain impacts
• Injection-molded polycarbonate/ABS shell
• EPS impact liner with extensive ventilation
• Fully adjustable vented visor
• High-flow filtered mouth vent promotes cooling airflow
• Flexible rubber nose piece helps deflect roost and debris
• Rear shell shape helps keep the goggle strap positioned securely
• Removable and washable moisture-wicking comfort liner
• Designed for motocross, trail, ATV, and off-road riding
• Size: Small

Thor Adult Helmet Size Chart

How to Measure: Wrap a soft measuring tape around the widest part of the head, just above the eyebrows and ears. Keep the tape level and comfortably snug.

Fit Note: A motocross helmet should fit securely around the crown and cheeks without painful pressure points or excessive movement. Do not intentionally size up for a loose fit.

The interactive size finder uses head circumference in inches to recommend the appropriate helmet size.