Oakley MOD1 Pro Helmet combines Dura-Matter construction with MIPS protection and a BOA adjustment system for durable, on-mountain impact safety and a low-profile skate-style fit. Key attributes: Gray | Dura-Matter | MIPS impact protection | Impact-resistant shell | Thermal-insulating liner | Fixed ventilation for airflow | ASTM F2040 and CE EN1077 certified | BOA fit adjustment | Fidlock magnetic buckle | Removable, machine-washable liner and earpads | Adjustable chin strap with velvet pad | Goggle-ventilation compatible vents | Helmet travel bag included | Streamlined rounded silhouette | Matte grey finish | Low-profile skate-style design | Discreet designer logo | Dimensions & fit: Standard: Small (51-55 cm) / Medium (55-59 cm) / Large (59-61 cm) / XL (61-63 cm) | Asian: Small (53-57 cm) / Medium (57-61 cm) / Large (61-65 cm) | Youth: Small (49-53 cm) / Medium (53-57 cm) | Standard fit | Asian fit available | Youth fit available | Composition & care: Removable liner and earpads are machine washable; follow manufacturer's care instructions.