Polartec Alpha Fast Forward

Polartec Alpha™ Next Gen | How Active Insulation Works Cold at the start, building heat on the climb? Active Insulation is all about thermoregulation: balancing warmth with breathability so your layer can stay on. Polartec invented Alpha™, the original Active Insulation. Its lofted fibers retain insulating air, while its open structure lets excess heat and moisture escape during activity. And if it gets wet, it dries quickly, too. The next generation introduces improved durability through a patent-pending construction that increases resistance to snagging and fiber shedding, plus new constructions, weights, and textures for greater design versatility. The range also includes styles blended with up to 40% merino wool. Discover what’s next for Polartec Alpha™.