The Women's Thorium AR Hoody combines ergonomic fit, premium craftsmanship & carefully selected fabrics. Lofty 750-fill European grey goose down delivers exceptional warmth for little weight, is durably resilient, & packs easily. The outer is soft, durable Arato 40 nylon. This lightweight material withstands abrasion, packs compactly & has a DWR finish to repel moisture. Arc'teryx designs are careful & intentional, & the Thorium's elevated performance comes from focused construction & patterning. The women's specific Athletic fit is streamlined & layers easily under a hardshell in cold conditions. Articulation built into the sleeves & gussets under the arm provide a level of freedom of movement not often found in an insulated jacket. Because the Thorium AR is intended as a midlayer, Arc'teryx is able to use sewn through construction to further reduce weight & increase packability. Arc'teryx Down Composite Mapping technology combines the goose down insulation with panels of Coreloft synthetic insulation in areas prone to moisture. Used in the hood, cuffs & under the arms, the Coreloft insulates even if wet. Down is used in the sleeves & around the body's core. The insulated Storm Hood fits close to the head for efficient thermal performance & a high level of visibility, & two zipped pockets secure small essentials.