Cool-weather comfort starts from the base. The Women's Thermal Base Layer Vest is constructed from Polartec® Power Grid fabric, providing versatile warmth and advanced thermoregulation. The highly breathable, quick drying and moisture-wicking fabric keeps you comfortable whether you are cruising or hitting hard intervals. The performance fabric includes odour resistance to help you stay fresh for longer. The high-stretch bi-component knit paired with contoured side panels move with your body for a premium range of motion.