Active insulation: keep your body core warm and comfortable when you're working hard in the cold with the Rab Mens Strata Vest.
Climbing, mountaineering, scrambling: they may all take place on chilly days but they also involve expending enough energy to work up a sweat. This super-packable little marvel delivers just the right amount of warmth for active pursuits in cold conditions but, although it traps a load of warm air and holds off the worst of the wind and wet, it doesn't hang onto moisture. This allows you stay comfortably insulated whether you wear it on its own or under a shell as a midlayer.
The fantastic level of breathability comes from the Polartec Alpha insulation. Very breathable in its own right, it's also more stable than other insulating materials, which means it doesn't need to be held together by dense layers of fabric. Because of this, more air permeable fabrics can be used, resulting in a brilliantly breathable garment, which of course complements the arms-free active warmth of the gilet design. Ingenious.