ABS hard-shell technology High visibility due to powerful reflectors Ponytail compatibility: Helmet well suited to plait wearers Forced Air Cooling Technology: Sophisticated ventilation system for an optimal head climate Excellent ventilation with 4 air inlets and 4 air outlets Size adjustment by means of a half ring made from particularly hard-wearing and slightly malleable plastic for optimal stability and form fitting Zoom Ace Urban: Finely adjustable adjustment system with handy adjustment wheel for customisable fit