NWT Stio Millibar GORE-TEX Jacket, Men's L. See Stio website for size chart. Not all mountain weather requires a stiff storm shell. Made as a more flexible alternative to technical overkill, our Millibar harnesses GORE-TEX INFINIUM™ WINDSTOPPER® technology to block wind, shed weather and stretch liberally — adeptly walking the ridgeline between protection and liberation with alpine style. Paired with a brushed grid backer for light warmth and underarm stretch panels for breathability, it maintains a comfortable core for alpine pursuits.