The Cerium SV Vest delivers core warmth for severe cold. High-loft 1000-fill goose down provides lightweight, packable insulation with Coreloft™ utilized in areas prone to moisture. The 100%-recycled 20D Pertex® Diamond Fuse outer is light, windproof, and has a diamond-filament construction that adds durability without adding weight. Multiple pockets offer storage, and a stuff sack’s included for transport. Designed for use as a standalone, this is our warmest, most durable Cerium Vest ever.