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Streamlined aerodynamic design reduces wind noise and drag. This bike full helmet uses a one-piece PC impact-resistant shell to maximize your safety. Designed with multiple air vents to ensure breathable and comfortable wearing conditions. The mountain bike helmet comes with 2 sets of removable and washable comfortable linings (including a set of spare linings). This mountain bike helmet is suitable for head circumference of 61-62cm/ 59-60cm (come with XL and L size removable linings).