The most comfortable trail jersey you will ever own. The Rapha Trail Merino Short-Sleeve T-shirt is made from Merino wool and nylon for enhanced comfort, therm-regulating properties, and durability. The natural properties of Merino wool make this T-shirt odor-resistant and can keep you warm even if wet. An additional moisture-wicking treatment was applied to the T-shirt to allow our sweat to be evaporated quicker so we stay more comfortable on the trail.