The Will Power gives us the edge we need over Mother Nature and her seasonal moodiness. Three layers in one lightweight cold and weather-beating piece. Wind-stopping and water-resistant shell. Dense, wicking, supple poly/spandex. Lightweight thermal poly-fill. 360° reflectivity. Two secure pockets. Only @ T9. XS(2), S(4-6), M(8-10), L(12-14), XL(16).