Santic 37.5 Yian Windproof Gilet Using NASA-inspired 37.5® technology, it regulates body temperature and evaporates sweat fast, keeping you comfortable in changing weather. The fabric is 32% warmer than fleece yet remains breathable, with antibacterial properties to stay fresh on long rides. A YKK double zipper makes it easy to adjust airflow, while multiple pockets give space for ride essentials. Reflective details ensure safety in low light. Perfect for beginners who want lightweight protection and pro-level comfort on every ride.