The Rab Mens Microlight Alpine Jacket is insulated with 140g /5oz (size large) of US750 fill European goose down & has a Pertex Microlight weather resistant outer fabric providing maximum warmth for minimal weight. The narrow baffle structure minimises down migration & provides optimum loft ensuring efficient heat distribution & allowing the jacket to be compressed down & stowed inside the chest pocket for ease of transport. Features Pertex Microlight 30D outer shell 140g (L) of 750 fill power superior quality European goose down Mini stitch-through baffles stabilise position of down Fixed, down filled hood 2 YKK zipped hand warmer pockets & 1 YKK zipped chest pocket Front zip with internal down filled baffle Lycra bound hem & cuffs Stuffs away into the chest pocket Medium cut Glossary Pertex Microlight Pertex Microlight is made from tightly woven yarns which help to prevent excessive heat loss through the fabric, making the garment warmer without adding weight. Using 33 decitex/30 denier yarns, it is both downproof & windproof, water-repellent & durable.