As the old-timers used to say "If it ain't broke don't fix it." And while that adage might have worked just fine for your Granddad's steel frame pickup the same philosophy doesn't apply to performance gear and clothing. So in the spirit of innovation and preemptively fixing things that aren't broken Patagonia brings you the Nano-Air Light Hybrid Jacket--a versatile layering piece that offers breathable and adaptive warmth for high-octane adventures in cold weather. Designed for trail running climbing and backcountry touring the Nano-Air Light Hybrid continues Patagonia's Nano-Air tradition with its lightweight durable and stretchy construction. The innovative difference in the Light Hybrid lies in its airy waffle knit construction on the underarms sides and back panel which efficiently releases excess body heat wicks moisture and dries quickly to ensure that you avoid clamminess and discomfort to stay dry and comfortably warm. Much like its elder siblings the Nano-Air Light Hybrid features FullRange synthetic insulation which offers a surprising amount of warmth for such a light package and stays mobile and stretchy as you run post-hole or ski your way around the mountain. DWR treatment protects you from errant moisture and light precipitation while two hand pockets accommodate a pack or harness and offer respite for cold digits. Not to mention the low-bulk cuffs feature subtle thumbholes for added coverage and easy layering.