Studds Thunder D5 is one of the sharpest helmets by STUDDS. The flip-up full-face helmet is aerodynamically superior to all its peers and is engineered for stability during long rides. Dynamic Ventilation System: Helps in the dissipation of heat Hypoallergenic Liner: Protects rider from allergies or infections arising from continuous contact with damp helmet liners due to extended riding or on hot/rainy days. Replaceable Liner: Ability to remove and clean the liners to maintain freshness over time. Quick Release Visor: Convenience to the rider for changing visors when required. Aerodynamic Design: The shape of an aerodynamic helmet can reduce the drag pressure and prevent the helmet from moving against the helmet.