Design The jersey with out using any ink for print UPF50+ UV fabrics vary in how effectively they block the sun. Sun Protection Factor (SPF) rating like that of sun cream to indicate how well they work. Look for high SPF ratings if you're riding in bright sunshine and more longer ridethere are wafer-thin cycling jerseys that keep you as cool as possible. They’re also ideal if you’re planning a tough mountain ride on a sunny day.As mentioned above, it is common for manufacturers to blend a combination of fabrics can make for a cycling jersey that is high quality, warm, moisture-wicking and retains its shape after multiple uses. The most common being polyester and elastane. Nearly all brands have quite tight cycling clothing these days. But the real aero cycling shirts have a really tight fit. There are really no flapping sleeves with aero shirts.