Maximum comfort design: adopting special aerodynamic design, 18 ventilation grilles circulate air, keeping the head cool and dry in hot conditions. In addition, our bicycle helmets are very lightweight, which can reduce the pressure on the head even if worn for a long time. Wearable and Wearable: Due to its wearable table system and side straps, the bicycle helmet is suitable for heads of various sizes, customizing a wearable and wearable system for most teenagers and adults. Sested head circumference: 54-62 centimeters (please measure the head before purchasing) Comfortable and versatile: Our women's bicycle helmets have high-quality ing that can absorb moisture and stay sweat free during hot summer travel. Lightweight, breathable, and comfortable, suitable for city travel, cycg, and motorcycle riding. Inner pad and detachable sun visor s: The sun visor is equipped with an adult bicycle helmet that can be easily and safely removed to help block sunlight from the eyes and prevent rainwater from entering the eyes.... The cushion it brings increases comfort, is easy to clean, as it is detachable, strengthens the internal structure, and ensures that the head is fully packaged in a safe and breathable manner.