Oakley Mod1 Pro Snow Helmets The MOD1 PRO is designed for increased overall durability while maintaining the same understated design as the MOD1. This classic skate-style helmet is available in multiple fits and sizes, making it ideal for any mountain activity and delivering level durability and immediate emergency information access. Executive Durability and Fit Engineered for increased strength and versatile application: Durability Focus: Designed for increased overall durability compared to the standard MOD1. Design: Maintains a classic, understated skate-style helmet aesthetic. Versatility: Available in multiple fits and sizes, making it ideal for any mountain activity. Integrated Emergency Technology Featuring critical, instant information access for safety: twICEme® Technology: Includes the twICEme® Medical ID NFC chip located on the back of the helmet. Instant Data Access: Allows emergency services to store and instantly access vital medical information and emergency contacts when they need it most. The Oakley MOD1 PRO Helmet is the choice for maximizing rugged durability, versatile fit, and instant access to life-saving medical data. Helmet Sizing Conversion Table Convert size based on head circumference for optimal fit. Sizing Guide Size Head Circumference (cm) Head Circumference (inches) Small 51-55 cm ~20.08-21.65 inches Medium 55-59 cm ~21.65-23.23 inches Large 59-61 cm ~23.23-24.02 inches XL 61-63 cm ~24.02-24.8 inches