Cerium Series: Streamlined, lightweight goose down filled jackets made of a composite construction to provide warmth where it is needed most. High warmth-to-weight ratio. SL: Uses the lightest weight materials available to provide high weather protection, performance and/or packability, but with the right amount of durability. Super minimalist vest version of the Cerium SL jacket offers great warmth to weight in a highly compressible 850 fill sewn through down piece. Intended as a very light and minimal midlayer in cool, dry conditions. Features: Super lightweight Arato(TM) 7 face fabric with DWR finish repels moisture Down Composite Mapping(TM) strategically places both down and synthetic insulation Lightweight and minimal centre front zipper Collar height provides warmth while layering easily Single external chest security pocket includes stuff sack Elasticized rear hem seals out drafts 850 fill European grey goose down Trim Fit, Hip Length Center back: 68 cm / 26.8 in, straight hem Weight: 115 g / 4.1 oz Activity: Multiple Activities Materials: Coreloft(TM) 40 (40g/m) insulation. Made with highly crimped multi-denier siliconized polyester yarn, this lightweight, breathable, and thermal efficient, 100% polyester staple fibre is very compressible and has excellent loft retention Coreloft(TM) 100 (100g/m) insulation. Made with highly crimped multi-denier siliconized polyester yarn, this lightweight, breathable, and thermally efficient, 100% polyester staple fiber is very compressible and has excellent loft retention. Arato(TM) 7 - 100% nylon 850 fill European white goose down