The K2 Meridian is an In-mold construction lightweight helmet only weighs 380grams making this the lightest ladies helmet in the range, leaving you comfortable & now having the feeling of being weighed down. It as passive channel venting, which directs the air-flow between your head & the helmet, keeping it cool. What's great about K2 helmets is their Dialed fit system, which creates a custom-fitting helmet with the twist of a dial. This liner is also removable, so you can wash it, which is a great feature & unique to K2.