Feature: 1. This adult mountain bike helmet is designed to fit head circumferences of 59-61cm, ensuring a snug and secure fit. 2. Equipped with an EEP chin support, this mountain bike helmet offers enhanced conservation. 3. Featuring a removable and washable comfort liner, this MTB helmet ensures easy maintenance and hygiene. 4. Designed with over 31 vents, this helmet provides ample airflow and cooling. 5. Lightweight in design, this helmet ensures long-term use without causing any strain or discomfort to your head and neck. Specification: No one enjoys Cycle in warm weather with a stifling helmet. That's why this helmet is designed with over 31 vents, ensuring abundant airflow and cooling to make your ride more comfortable. Features: This adult mountain bike helmet is designed to fit head circumferences of 59-61cm, ensuring a snug and secure fit. Equipped with an EPP chin support, this mountain bike helmet offers enhanced conservation. Featuring a removable and washable comfort liner, this helmet ensures easy maintenance and hygiene. Designed with over 31 vents, this helmet provides ample airflow and cooling. Lightweight in design, this helmet ensures long-term use without causing any strain or discomfort to your head and neck. Specifications: Material: PC, EPS Color: Camouflage Orange/ Camouflage Blue/ Camouflage Green/ Black/ Black & White/ Black & Red/Black & Grey/ Camouflage Grey (optional) M for head circumference 55-58CM L for head circumference 59-61CM L Size: 36.8*24.6*28cm/ 14.5*9.7*11in M Size：36*23.5*27cm/14.2* 9.9*10.6in Weight: 710g/ 25oz Package list: 1 * helmet. Package List: 1 * bike helmet