Note: The color is according to the first picture,the quantity and size are according to the title,if the title is not clearly written,according to the . Our products Features: 1. Large vents help to circulate air through the bike helmet,releasing warm air out from the rear vents,leaving your head cool and fresh,perfect for long summer rides. 2. Adjusts in seconds with a quick release chin strap and a dial fit at the back adjustable horizontally and vertically for a tighter and snugger fit. 3. The bike helmets for adults fearture perfect resistance PC material-wear resistant and scratch-resistant. 4. EPS collision-resistant composite ultra-light material not only absorb the collision but also effectively reducing the shock pressure to protect the head during crash. 5. Utilizes the Multi-Directional collision Protection System to redirect energy in a crash. Notice: *Actual color may be slightly different from the image due to different monitor and light effect *Please allow 1-3cm deviation due to manual measurement : Head width: 17.5cm Head length 16cm~21cm Head circumference: 58-61cm Weight: about 185 g includes: 1 x Bicycle Helmet