You'll stay warm without overheating in this vest. The breathable insulation and lightweight shell create warmth without bulk The low-profile vest can be worn under a jacket or on top of a base layer in warmer conditions Athletic fit Stand-up collar Sleeveless with elastic armholes Side slip-in pockets; Zip chest pocket; Full zip; Drawcord-adjustable hem Polartec® Alpha padding for lightweight warmth and insulation even when wet; Pertex® Quantum® GL fabric for best strength-to-weight ratio