100 aircraft dh helmet biturbo whitethe bi turbo white aircraft dh helmet is precision engineered with a carbonkevlar composite shell providing an ultra lightweight design enhanced venting channels manage airflow to create one of the most ventilated dh helmets on the market features aerospace carbonkevlar composite shell active cooling system maximises airflow offering more ventilation than any other helmet washable antibacterial liner cheek pads and chin strap covers emergency release c