Together, they make the perfect ski jacket. Separately, they have a multitude of uses from urban rain jacket to warm hiking shirt. The outer jacket protects you from the elements with 20k/20k fabric; the DWR treated inner jacket provides water-repellent protection. The outer jacket has plenty of stretch and a longer hip-covering fit; the insulated shirt offers breathable warmth with PrimaLoft® Black Eco 100g insulation. Wear the inner jacket and outer shell together for skiing or separately for other mountain activities or in the city.