The Lumin Jacket is new to M.E. for winter 2014, & it is the warmest in their lightweight down jacket range. This is thanks to the ultra-compressible & lightweight He (Helium) 30 fabric, the high loft baffle construction & the WR Down 675 that fills it. The use of down ensures the best warmth to weight ratio & compressibility of any other forms of insulation. WR Down does not mean you can now wear your down jacket in the rain! It means that the down resists the absorption of moisture therefore increasing the downs performance when it comes to wicking moisture away from your body. Unless your down jacket states that is 100% waterproof, it is still only suitable for cold dry conditions. The Lumin has an adjustable Light Dome HC (Helmet Compatible) Hood. The Light Dome hood isn’t designed for all-day helmet use but will do the job when absolutely necessary. M.E. only uses Down Codex Audited Animal Welfare approved sources for all their Down filled products marked with the Down Codex Stamp. Helium 30 outer shell is exceptionally lightweight & downproof 220g (Size L) of water resistant 90/10 Pure Down with a fill power of 675 Lightweight stitched-through quilted construction throughout Adjustable Light Dome HC Hood 2-way YKK moulded centre front zip 2 zipped hand warmer pockets Inner zipped security pocket Lycra bound cuffs & adjustable dual tether hem drawcords For all you kit geeks out there, the links below will take you to Mountain Equipments Information pages where they will explain this jackets different fabrics, fills & constructions techniques in greater detail. Helium 30 WR 675 Down (WR means the down has been treated with a water repellent coating to improve moisture management, currently wait for M.E. to update this section) Light Dome Hood Dual Tether Drawcords 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.