Keep warm while climbing up to the top with the aptly titled Rab Generator Alpine Jacket. It stokes up your warmth effortlessly with 2-different weights of Primaloft insulation. In the torso, we find a heavier weight where mobility isn't as much of a problem, and on the arms, it's a little less so we can move around easier. Plus the articulated sleeve design allows all the motion we need as we're constantly giving and taking slack to our climbing buddy.