It's not often that you find a piece you're comfortable wearing both for the summit push and for the post-send celebration dinner — but that was before the Rab Women's Xenair Vest. Made using body mapped Primaloft Gold synthetic insulation of two different weights, this puffy vest is breathable while still packing the heat where you need it most. The sleeveless style makes this an ideal active layer, fitting comfortably underneath a heavier midlayer or shell, and it can be worn on its own thanks to the weather-resistant Pertex Quantum face fabric. And in case things heat up on the ascent, the Xenair vest can be stuffed into its pocket and clipped onto a harness for quick and easy storage.