Versatile and easy to layer, the Arc'teryx Delta Half Zip Hoodie is comprised of Polartec® Power Dry® grid-style fleece and consequently offers an incredible warmth-to-weight ratio. Perfect for wearing under a more substantial mid-layer on those extra chilly days or directly beneath your shell on higher output ascents, the deep front zipper and low profile hood give you all the control to either add warmth or remove it.