SECURE FALL PROTECTION: Bikeroo's MTB Road Mountain adult bike helmet's durable PC shell & EPS foam inner lining for head protection. It provides excellent shielding from the bumps & scrapes men and women cyclists run into on a regular basis. CUSTOM FIT SYSTEM: This bike helmet for adults has adjustable straps that fit head circumferences from 56 - 62cm. With the quick-release buckle, it ensures proper safety protection for men and women on mountain bikes and road cycling adventures LIGHTWEIGHT COMFORT DESIGN: MTB helmet is engineered for extended wear with minimal weight. This helps reduce rider fatigue during long mountain bike rides, all-day road cycling routes, daily bicycle commuting, and more! KEEP A COOL HEAD: Multiple strategic air vents help air circulate for improved temperature regulation during intense hot-weather road & trail cycling. The breathable padding enhances comfort without overheating you for all-day bike adventures INTEGRATED SUN VISOR: The built-in bike helmet visor provides excellent lateral visibility and protection from sun, rain and debris - it's essential for mountain biking trails and road cycling to prevent eye fatigue in variable light conditions