Worn as a midlayer or standalone, the Delta MX Hoody from Arcteryx has design rooted in climbing, but refined to perform across a range of alpine activities. The air-permeable Polartec Power Dry fleece delivers a high warmth to weight ratio, has a smooth face that layers easily under a shell, and leverages voided grid construction for thermal efficiency and lighter weight. Its streamlined hood fits under a helmet and integrates a Phasic AR panel that can be worn as a neck gaiter or balaclava.