The Pearl Izumi Men's UltraSensor Infini T Shirt is lightweight and breathable for optimal performance. UltraSensor-Stretch mesh body increases flexibility, and lightweight UltraSensor-Grid side and yoke panels increases ventilation. Offset flatlocked seams eliminate friction. Pearl Izumi’s exclusive Ultrasensor® moisture-transfer fabric providing one-way capillary action to the outer surface for quick evaporation for the life of the garment. Superior moisture-transfer construction keeps you dry and comfortable. Semi-form fit is less restrictive for high performance.