You've dismounted from your bike to scope out the sketchy line you're about to drop into, which plunges over a steep boulder and onto the trail below. Luckily, you're wearing the Ion Men's Traze AMP Short-Sleeve Jersey with its breathable fabric keeping you cool and comfortable when your heart rate increases and you begin to sweat. This knitted fabric provides an active cooling effect by rapidly transferring sweat to the surface of the fabric where it readily evaporates into the surrounding air. Not only does this fabric prevent you from overheating on long uphill slogs and heart-pounding sections of trail, but it's constructed from recycled materials that are eco-friendly without sacrificing performance.