The Rab Ascent is a lightweight down jacket that features 330g of 650+ fill down with a stitch-through baffle construction providing a consistent level of insulation throughout. It also has a Pertex Endurance* 50D shell that keeps the down dry without affecting breathability. Other features include a detachable down-filled hood with a wired peak, 2 zipped fleece-lined hand warmer pockets & a fleece-lined collar. Glossary: Pertex Endurance: Designed to keep down insulation dry & ensure maximum warmth. Micro-porous coating improves water resistance without affecting breathability.