Outdoor Mountaineering Downhill Helmet Riding Hat Expand Protective Helmet $ 31.30 Overview: ABS material has high strength, good corrosion resistance and wear resistance Ventilation holes: heat will be generated inside the helmet when used for a long time, and the ventilation holes can effectively dissipate heat and ventilate. When the decoration rotates to the left, the head circumference increases, and when it rotates to the right, the head circumference decreases. Head circumference 52-62cm The helmet is equipped with four headlight cards (two front and rear), which can effectively fix the headlights Product information: Full name: Mountaineering helmet Material: EPS+PC Size: 52CM-62CM are all adjustable Weight: net weight 305g Range of use: mountaineering and rock climbing expansion Fire rescue caves, downhill head protection, etc. Packing list: Mountaineering helmet*1