The Cerium LT Hoody is a specialist lightweight down jacket that can be used as an active user’s winter mid layer or as a standalone piece in cold dry conditions. It weights next to nothing, has clever mapped insulation & can be stuffed into its own stuff sack for easy storage. The Cerium is beautifully made, as you would expect from Arcteryx, but the really clever thing is the way that they have made the jacket so light. Traditional down jackets are made lighter by simply reducing the amount of down & using super lightweight, fragile materials. Arcteryx however have stuffed the Cerium with 850 fill power European Goose Down & given it a high tenacity face fabric. Weight reduction has been achieved through ingenious engineering techniques. For example the baffles on the elbows are narrower on the inside because your arm is naturally bent, so that area needs less fabric, the hem draw cords are reduced & only pull in the back of the jacket & the whole jacket is anatomically cut to reduce surplus fabrics. The Cerium also uses strategically placed Coreloft siliconised polyester synthetic insulation in areas that receive the most moisture & are affected by compression. The shoulders are Coreloft insulated as are the hem, sleeves & underarms. Coreloft retains warmth even when wet & resists compression better than down; so you get the best of both types of insulation, unrivaled warmth & comfort from the down in the main body & protection from Coreloft in strategic areas. The face fabric is called Airetica & is a 34g/² high tenacity 20 x 10 denier mini rip stop Nylon which has been treated with a DWR (durable water repellent), so it is tough, wind resistant, highly breathable & has a smooth feel & soft handle. The end result of all this technology, superior craftsmanship & Arcteryx gorgeousness is a down jacket that fits & feels fantastically well, performs in all mountain environments & looks brilliant. 850 fill power European Goose Down Coreloft 80 g/m² insulation Nylon rip stop face fabric Insulated storm hood Full front zip with chin guard & wind flap Elasticated cuffs Adjustable hem drawcord 2 zipped hand pockets Stuff sack included Trim fit