The Deltas warm, efficient, made to move were created for climbing. Evolution and refinement have led to a versatile design ready for any mountain adventure. A great cold-weather midlayer or standalone in milder temperatures Arcteryxs Delta stretchy Polartec Power Dry fleeces voided grid construction delivers a high warmth-to-weight ratio and has a smooth face that layers easily under a shell. The ScubaHood fits under a helmet and integrates a panel that wears as a neck gaiter or balaclava.