Feature 13D Keel Design: The bike helmet adopts 3D keel design, which greatly improves the structural strength of the helmet and provides better protection when impacted. 2Good Heat Dissipation: 16 hole air guide helps heat dissipation and ventilation, enhances air flow, reduces air resistance, and ensures that riding is not stuffy. 3PC and EPS Material: PC shell wrapped and high density EPS helmet, seamless connection of two materials, balanced energy absorption, effective mitigation of impact. 4Comfortable and Breathable: Removable lining is comfortable and breathable, keep the contact distance between the head and helmet, more comfortable and easier to clean. 5Shock Absorption: Bike helmet has excellent shock absorption and drop resistance, effectively reducing impact forces and providing you with the most reliable safety.Item Type:Bike HelmetMaterial: PC, EPSWeight: Approx. 660g / 23.3ozHead Circumference: Approx. 61-65cm / 24.0-25.6in .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 xHelmet4 xRepairPatch1 x Manual