The Pearl Izumi Men's Transfer Wool Long-Sleeve Base Layer regulates your body temperature when you're riding in cool-to-mild conditions. Wear this base layer under your preferred jersey, vest, or jacket for customizable warmth and comfort. By combining the warmth and supremely soft feel of merino wool with the quick-drying performance of polyester, Pearl created an ideal base layer for riding in all but the hot summer weather. This performance-orientated blend wicks perspiration away from your body, helping to regulate your temperature when you're working up a sweat. Additionally, you'll find its anatomic, close-to-body fit and built-in thumbholes keep you warm by sealing out cooler weather and changing conditions.