The Arc'teryx Delta Men's Jacket is cut from Polartec Power Dry Midwarmth grid backed jersey, this stuff is an air permeable fleece mid layer, comfortable next to the skin, efficient at moving moisture to keep your core dry, with a weave that traps warm air where you need it. Voided grid construction delivers a high warmth to weight ratio, paired with a 16% elastane content this provides outstanding freedom of movement, which is what you’d expect from a piece climbers helped to create. A streamlined efficiency of design in an athletic fit with thumbhole cuffs for sliding easily into other layers this has a smooth outer layer for even greater ease in layering, and durability when worn on its own. A piece with a place in everything from your backcountry layering kit to your kayak dry bag this warmth trapping, quick drying, efficient and stretchy fleece is an outdoor staple that won’t let you down. A midlayer in cold conditions, a standalone in cooler temperatures, and a piece that crushes down easily to fit in a pack.