Giro Trig Mips. A low-profile hard shell helmet with a small brim that's combined with MIPS Spherical Technology. MIPS aids in the reduction of rotational energy during most impacts. Thermostat Control Adjustable Venting allows for perfect airflow whether ascending or descending, and the Stack Ventilation keeps your goggles fog free no matter what your energy output. Meanwhile, its fit can be customized at the turn of a dial via the In Form Fit System.