The Cerium SV Vest delivers core warmth for severe cold. High-loft 1000-fill goose down provides lightweight, packable insulation with Coreloft(TM) utilized in areas prone to moisture. The 100%-recycled 20D PertexA(R) 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. Features: Moisture-resistant outer face fabric Breathable Great warmth-to-weight ratio Lightweight Compressible and packable Durable Wind resistant