When the temperature is low but activity continues the M's Fraction Vest™ is a welcome layer of insulation. PrimaLoft® Sport 60g insulation and an ultralight water-resistant 15D box ripstop polyester shell keep you warm and protected at a fraction of the weight. Handwarmer pockets provide refuge to cold fingers and an internal pocket doubles as a storage sack Avg. weight: 9.7 oz./275 g (size L)