When it comes to cool, dry climates, the Arc'teryx Men's Cerium LT Down Jacket knows a thing or two about ensuring lightweight warmth and performance. The Cerium LT touts a hybrid construction and slim fit that makes it ideal for backcountry pursuits, climbing in chilly conditions, snowshoeing with the family, or simply for wearing around town.More specifically, the Cerium is outfitted with 850-fill goose down in the torso and arms for core warmth, while the synthetic Coreloft insulation in the shoulders, collar, and hem is designed to maintain warmth, despite the fact that those areas often get exposed to moisture—so you stay warm, even when wet. Additionally, this amalgam of insulation is breathable, efficient, and compressible, so you're able to regulate your temperature with little-to-no effort. Meanwhile, the Arato 10 exterior is tenacious and lightweight, and also features a DWR treatment that sheds light moisture should you encounter an unexpected snow flurry.Not to mention, Arc'teryx designers really made a name for themselves with to their fine attention to detail—and the Cerium jacket illustrates their expertise. Light elastic cuffs won't pinch your wrists but easily rebuke cold air attempting to permeate your baselayers. A chin guard at the collar prevents unsavory hot spots and chafing, and the included stuff sack makes it easy to pack the Cerium when you're taking off for a week of hiking and climbing, and are in need something to keep you warm on cool evenings.