You'll stay warm without overheating in this vest. The breathable insulation and lightweight shell create warmth without bulk for activities like running and cross-country skiing. The low-profile vest can be worn under a jacket or on top of a base layer in warmer conditions. Athletic fit is wide at the chest and snug in the body and sleeves Stand-up collar Sleeveless with elastic armholes Side slip-in pockets; Zip chest pocket; Full zip; Drawcord-adjustable hem Polartec® Alpha padding for light