The new Giro Terra MIPS Hemet is sleek, lightweight, and has all the necessary features to keep you comfortable when you're out on the mountain all day. The MIPS technology works by allowing two liners to move independently of each other when the helmet is subject to force, reducing rotational energy during certain impacts. An in-mold construction, which fuses the outer shell to the foam liner, keeps the Terra lightweight and allows more thorough ventilation. Giro's Passive Aggressive Venting System adds to this by combining the exterior vent design with interior channeling that lets cool air flow when you're in motion, and lets warm air escape through the top of the helmet if you're standing still. A low-profile dial adjustment ensures you can easily customize your fit on the go for a solid, performance-oriented feel.