SmartWool PHD Women's V-Neck Running T-Shirt Raglan Sleeves - Strategically designed raglan sleeves remove underam seams Functional Fabrics - Merino wool regulates body temperature, heart rate and deposits due to its natural moisture-management and thermoregulation properties. Interior Flatlock Seams - Provides additional comfort and helps to prevent the risk of chafing. Reflective - 360 reflectivity for visibility. UPF 30 Rating - This garment delivers effective protection from harmful UV rays.