Package Included: Helmet*1 Specifications: Brand: RNOX FOR: Road bike, mountain bike TECHNOLOGY: In-Mold COLOR: Black, Blue, Red, Gray, White size :52-64 WIDTH: 17.5CM WEIGHT: 250g VENTS: 11 MATERIAL: Shell imported PC + internal imported EPS Outer Shell Construction:In-mold polycarbonate shell with EPS liner Inner Shell:Thermoformed reinforcement shock absorbing CONSTRUCTION: External IN-MOLD (integrated molding) impact resistant PC, internal EPS integrated molding to absorb impact technology Description: Very light weight, about 250g only helmet appox. Use air cooling make the air free,Anatomic design,senior double-sided velvet protection pad ,Easy to use,with magic buckle connection. 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.