Rab microlight alpine jacket the microlight alpine jacket is a light weight weather resistant down jacket designed for use in situations where warmth weight and packability are prime concerns a mini stitch through baffle construction and a minimal uncluttered design make the microlight alpine jacket a perfect layering piece for alpine climbers or an adaptable stand alone jacket for day to day use 143g large of 750fp hydrophobic goose down provides exceptional levels of warmth without