evo.com | Arc'teryx Midlayer Vests > The Arc'teryx Cerium Vest is extremely light and packable while delivering premium warmth through responsibly-sourced 850-fill down with strategic Coreloft(TM) synthetic insulation in moisture-prone areas. Built with recycled 15D Arato(TM) nylon for lightweight durability, this streamlined vest layers seamlessly under shells or works standalone in cool, dry conditions. Trim Fit Arc'teryx trimmer fit is patterned to stay close to the body through the chest, waist, hip, and thigh. Its low profile eliminates bulk, moves with the body, and fits comfortably over first layers or under outer layers. Body Arato(TM) 15 100% Nylon Articulated Patterning Includes Stuff Sack Adjustable Hem Drawcord | Women's Arc'teryx Cerium Vest 2026 - Medium Blue | Nylon