The Rab® Xenair Alpine Flex Jacket eliminates the stop-and-strip routine with PrimaLoft® Gold Active+ insulation that breathes through fluctuating output levels and low-bulk Thermic™ stretch panels that keep you mobile. Pertex® Quantum Air fabric deflects wind while responding to your effort, so you stay comfortable pushing through tough ascents without overheating. Packable enough to stash, adaptable enough to wear from dawn starts to summit pushes, whether as a warm layer or technical outer.