Item Specifics: Material:The fully-formed ABS provides superior protection from the outside, while high-quality EPS foam absorbs shock on impact from the inside 11 vents with internal channeling for optimal airflow, ventilation, and keep you cool and comfortable for sports The interior padding system,2 sets of interchangeable pads with different thickness (5 mm and 8 mm) for a custom fit Suitable users Various simple solid matte finish colors and sizes for users of different ages, genders, head circumferences,choose the helmet size according to the head circumference classification Toddler / Kids / Children / Girls / Boys / Youth Suitable sports Skateboarding Bike Roller skating Inline skating Scooter Longboard Rollerblading Hoverboard Cycling Mountain biking BMX biking Hiking Camping Package includes: 1 X Helmet 2 X Helmet Liner (5mm、8mm) 1 X Drawstring Bag Note If you are not satisfied with our helmet , let us know and you will be offered a Full Refund or Replacement,enjoy this absolutely RISK FREE ,perfect for many kind sports ,ties and adjusts easily