As close as we're going to get to running in our birthday suits. Yes, a full-zip, hooded jacket that weighs in at only 3 ounces. Three ounces of wind and water-resistance. 3 ounces of breathability. 3 ounces of perfect weather protection. Stuffs into our pocket, or its own. Nylon ripstop. XS(0-2), S(4-6), M(8-10), L(12-14), XL(16).