The women's Delta LT provides streamlined warmth for little weight as a standalone jacket and lightweight mid-layer. Arc'teryx designed it with Polartec® Classic 100 micro velour small grid fleece. This fleece is highly air permeable, dries quickly, and a compresses to small packing size. Its women's specific trim-fit enhances freedom of movement while remaining close to your core, retaining body heat and improving layering. The high-collar design is warm and helps when layering, while a chin guard protects against zipper chaffing. Articulation prevents its sleeves from riding up your arms. Gusseted underarms make it easier to extend your reach. The front opens with a No Slip Zip™, which works like a series of speed bumps preventing the zipper from self-opening.