Tackle any climate while you ride with Klim Aggressor base layers under your gear. Made from a highly breathable for way stretch fabric, these base layers let cool air in while containing just enough heat to regulate your core temperature. Low profile contrast stitching keeps friction from occurring between your body and gear. Low profile contrast stitching Imperceptible seams Made from polyester and spandex Anti-microbial Moisture-wicking Breathable Fast drying