Keenso Safety Helmet, Lightweight Safety Helmet Adjustable Climbing Helmet for Riding Mountaineering Rock Climbing Wading Caving Mountaineering and Camping ??Has 12 ventilation holes?: With 12 ventilation holes, the helmet can effectively ventilate and cool. The helmet is comfortable to wear even during long journeys and is also suitable for summer. ??Precise adjustment?: The helmet has an adjustable system, you can make precise adjustments, and the inside of the helmet is soft and comfortable, which can reduce head injuries under pressure. ??Buckle design adopts?: With a buckle, it is easy to wear and take off, suitable for head circumference of 53-63cm, suitable for most people, and can be worn by both men and women. Perfect for Outdoor Activities: The helmet is suitable for mountaineering, rock climbing, downhill, caving, rafting, wading, cycling, skateboarding, roller skating and other outdoor activities.