This half-zip jacket, designed specifically for trail running, is made from 100% recycled PrimaLoft Active Evolve fleece fabric, serving as a dynamic mid-layer for warmth. This biomimetic fabric is lighter and more breathable than wool, mimicking animal fur. It balances breathability and warmth for high-intensity workouts. From the hood and thumbholes at the cuffs to the drawstring adjustable hem, the ergonomic design ensures a comfortable fit for athletic activities.