Giro Envi Spherical Helmet Features: Mips® Spherical In-Mold Construction Thermostat Control™ Adjustable Venting - Allows Custom-Tuning Of Airflow Instantly With A Simple, Low-Profile Control Button On The Outside Of The Helmet Stack Vent™ Technology In Form™ 2 Fit System - Lighter And Lower-Profile Than The Original, Making It Even Easier To Dial In A Custom Fit In Seconds, Even With Gloves On. On-The-Fly Vertical Tuning - Accommodates Different Goggles And Head Shapes For A Custom Fit Free Of Gaper Gap. 400G (Size Medium) Ce En1077 Plush Max Padding Fidlock® Magnetic Buckle Closure Mips® Equipped   Envi Spherical Helmet