This jacket is amazing - extremely lightweight & packable, it especially suitable for bike packing & travel in changing weather. A couple of design features make it special: since the jacket is designed for staying warm while cycling and other aerobic activities, the arm cuffs, pits, and area around your face/mouth are insulated with a super lightweight synthetic material that isn't affected by moisture; the jacket has a 2-way main zipper that's great for riding; the jacket also includes a compression sack with a volume equivalent to about 2 fists in size. It's also a more athletic fit than most down jackets which reduces flapping on the bike (size medium is perfect for my 39" chest & 32" waist). Potential negatives? It's a minimal design with thin fabric, so be careful around thorny brush, sharp objects & campfires, etc. If you take care of your gear, this jacket is a must-have lightweight piece of kit.