A vest or sleeveless jackets is extremely versatile, as it isn't constricting or bulky, yet provides warmth where you need it. This Columbia jacket features thermal reflective lining, which is sure to keep you warm, and it made up of water-resistant fabric. It has binding at collar, cuff, and armhole, for added robustness, and a drawcord adjustable hem that provides a snug fit. Water-resistant fabric. Omni-Heat™ Thermal Reflective lining. Synthetic insulation.