The Odin Vest, like other vests has been designed to protect your core from the icy winter air & sub-zero temperatures, & because it is a vest it has no bulk around the arms allowing greater freedom of movement when layer under something or as a throw on over the top piece. Using WR Down 625 not only provides great moisture management thanks to the Teflon based water repellent treatment, the use of down ensures the best warmth to weight & compressibility ratio of any other forms of insulation. Lightweight rip stop shell with DWR finish 180g [ Size L] of 85/15 Down with a fill power of 625 Stitched-through baffle construction throughout YKK centre front zipper with rear insulated baffle 2 zipped hand warmer pockets Inner zipped security pocket Elasticated armholes Drawcords at hem & neck Most people are scared to wash their down jackets but like all equipment it does need to be maintained. It is actually really easy! Feel free to give the shop a call from 09:00 until 17:30 Monday to Saturday (19:30 on a Wednesday), as we are always happy to help & give friendly advice. Or if you are reading this outside our normal opening hours here is a useful link to Trekitts recommended product for washing & caring for down Nikwax Down Wash I hope this helps.