Bicycle Cycling Helmet City Safety protection Ultralight Road Bike Helmet Anti-collision MTB Mountain Sports Cap Casco Ciclismo 1. Anti-collision design- This bicycle helmet is designed for adults. Made of sturdy and durable PC material and EPS foam, it can help to slow down the impact and protect the head. 2. A special aerodynamic and ventilated design that allows air to pass through the bicycle helmet to help to increase speed and stay cool and comfortable. 3, Ultra-light design- this bicycle helmet is lightweight, the inner pad is made of breathable material, which is comfortable to wear. Specifications: Product name: road bike helmet Gross weight: about 200g Material: PC EPS Color: black, white, white red, black green Size: One size head circumference is 55-60cm/ 21.65"- 23.62", head width is 17.5cm/ 6.88", and there is a adjuster knob to adjust the size of the head circumference. Package Included: Road bike helmet*1 Notes: Please check the detail size/model information before purchasing. Due to the different monitor and light effect , the actual color of the item might be slightly different from the color showed on the pictures . Thanks for your understanding. Please allow 1-2 cmmeasuring deviation due to manual measurement. Chat with us should you need any assistance.