Made of lightweight PolartecÂ® AlphaÂ®, the first-ever breathable puffy insulation for active warmth, theÂ Alpha Shirt JacketÂ offers a unique combination of lightweight, breathable insulation and weather resistance that makes it comfortable throughout a wide range of conditions. It can be worn as a breathable midlayer for active warmth, or as a light jacket for casual use. It’s made of 60g PolartecÂ® AlphaÂ®, the first-ever breathable puffy insulation, developed for U.S. Special Operations Forces and now available through Strafe. Unlike down or classic synthetic fill, which require the use of “closed” fabrics, PolartecÂ® AlphaÂ® is a highly stable insulation that won’t poke through or migrate. This creates an air permeable puffy insulation package for the Alpha Shirt Jacket that’s not a vapor barrier, so it breathes with you for active warmth. It also dries dramatically faster than other puffy insulations and is remarkably compressible. The Alpha Shirt Jacket is finished with a PolartecÂ® NeoShellÂ® collar, custom Strafe snap buttons, and an embroidered logo.