Cool, crisp mornings on the trail require the lightweight, versatile insulation of the Rab Cirrus Flex Vest. The lofty vest packs down into its own pocket so we can easily throw it in our pack for extra warmth when we need it, and the cozy PrimaLoft Silver RISE insulation is constantly ready to deliver that warmth. The tough Pertex Quantum outer material has a water-resistant treatment to repel light rain from passing showers, and the synthetic insulation maintains its warmth even while wet.