When we're spending multiple days in the mountains we need the Rab Cirrus Ultra Hooded Jacket for lightweight, compact warmth. The Pertex Quantum Pro material is incredibly breathable, with a water-resistant treatment that repels light moisture when we're up against icy cliffs. The Jacket is packed with PrimaLoft insulation that maintains its heat-trapping qualities while wet, and the Thermo Ionic Lining Technology (TILT) reflects heat back to us because every bit of warmth makes a big difference on the mountain.