Starting with durable 600-denier nylon, the outer shell is then treated with polyurethane for true water resistance, no matter how inclement riding conditions may get. Internally, the fully removable AirGuard liner helps prevent wind chill from becoming a factor. When things do warm up, Scorpion's AirVent™ ventilation system kicks in. Consisting of two zippered high-flow air intake panels in the front of the jacket and two matching rear vents, airflow over the body's core is maximized when the panels are unzipped. Should it get chilly, simply zip-up to seal out any unwanted airflow.