When used for extended periods, comfort, line of sight and adjustability were top of the design list when Climbing Technology set about building their EN 12492 compliant, ventilated Aries Tree helmet. The CT Aries Tree offers excellent eyesight aloft without the need to tilt the head back too far, and its ergonomic design makes this helmet one of the most comfortable on the market. The high impact ABS shell features permanently open vent holes for excellent internal ventilation. You can adjust the headband's height into two different positions and interior webbing, and breathable Cordura frame is washable and replaceable. The rear turn-knob facilitates the headband adjustment.