Body: 100% Recycled Polyester. Underarm: 100% Recycled Polyester Mesh. The FOX MTB Jersey Defend, crafted by FOX RACING, offers unparalleled durability you can trust in the mountains. This long-sleeve jersey is designed to tackle even the most extreme trails, featuring strategically placed, abrasion-resistant zones that protect both you and the fabric from wear and tear caused by rough trail conditions. Additionally, mesh panels ensure targeted cooling to keep you comfortable during intense rides.