The North Face named this jacket Impervious because it is. The full Gore-Tex construction is guaranteed waterproof breathable, so you don't have to worry about a storm popping up if the Men's Impervious Jacket is in your pack. The North Face calls the Impervious a hybrid jacket, because the main body is made with ultra- lightweight, packable Gore Tex Paclite fabric, while the areas of higher stress, the hood, sleeves, and shoulders, are more durable Gore Tex 3L. The attached hood is fully adjustable and helmet-friendly. Ventilation is taken care of with zippered underarm vents and vented chest pockets, so you can really open the Impervious up if it starts getting too warm. Other features, like the brushed internal collar lining and bonded, no-bulk cuffs add comfort and usability to make the Impervious one of the most versatile jackets in The North Face' arsenal.