【Size】 56-61cm 【High-Performance SG Mark Bicycle Helmet】 This product is an SG mark certified product approved by the Safety Association. The "SG Mark Standard" is a globally unique standard that guarantees safety standards, product certification, and accident compensation for products certified by the Product Association. The government encourages the wearing of products with the SG mark. Please choose a helmet that can firmly protect your head. 【Comfortable and Highly Breathable】 The rationally designed bicycle helmet takes into account reducing air resistance based on aerodynamics. The bicycle helmet has large ventilation holes, allowing air to pass through while maintaining effective ventilation, making it less stuffy and comfortable to wear. The visor of the bicycle helmet is removable, and the inner helmet has removable pads that can be easily cleaned to maintain a clean condition. 【High Impact Resistance Sports Helmet Bicycle Helmet】 High-density EPS and high-density PC materials with excellent shock absorption are used, effectively absorbing external impact forces. While ensuring safety, the weight is minimized. It is so light that you don't feel the weight, and it is a comfortable bicycle helmet even when worn for a long time. It combines high impact absorption and durability, protecting the head directly from impact, and is a bicycle helmet for adults that can provide scientific/professional protection for the head when exercising such as cycling, skateboarding, kickboarding, inline skating, BMX, and MTB. Easy-to-Attach and Detach Bicycle Helmet for Adults 1. Adjust the length of the strap 2. Leave a gap for one finger 3. Adjust the position so it doesn't slip 4. Check if it is securely attached. Usage scenarios for adult bicycle helmets: Suitable for head circumferences: 58cm to 61cm - Rollerblading - Balance bikes 【SG Certification】Genki Bicycle Helmet SG Mark Certified Bicycle Helmet for Adults and Children, Impact Resistant, Lightweight, Adjustable Size, SG Standard, Road Bike, with Sun Visor, Men and Women, Cycling 9351087