The most technical fleece in the Arc’teryx lineup, the Delta Half-Zip delivers moisture-wicking warmth with minimal weight and maximum comfort. The soft and stretchy Octa™ fleece is engineered with hollow fibers that trap more heat while reducing weight. It’s also exceptionally breathable for high-output pursuits, and wicks moisture and dries rapidly to keep you from getting bogged down with sweat. Smooth seams won’t chafe or irritate, even when wearing a pack, and the fitted cut allows comfortable layering under insulation or a shell when the weather gets more severe.