Designed for intense conditions and fast-moving adventures, the Summit L5 Fuseform GTX C-Knit Jacket is the lightweight, durable shell you'll want in your pack. Its three-layer Gore-Tex seals out rain and snow while allowing vapor to escape, preventing you from feeling like a walking sauna as you work up a sweat. The Gore C-Knit backer enhances airflow while keeping the shell's weight low. Constructed with FuseForm technology, this jacket is engineered to reduce seams which in turn reduces friction point and extends its durability. The back panel has zippered vents that let you adjust in response to how much airflow you need from moment to moment, while the adjustable hood, hem, and cuffs seal out drafts.