Alpinestars descender windproof jacketthe lightweight comfortable and highly durable descender windproof jacket is constructed from a windproof and water resistant main shell that offers great breathability with strategically placed ventilation and a micro fleece collar this jacket is a hugely versatile addition to your kit bag features lightweight and strong 25 layer jacket constructed from a windproof and water resistant rip stopstrategically positioned ventilation exhaust opening on back