The On Running Performance Lumos Long Sleeve Women's Running Tee is ultralight and highly reflective to help you stand out in low light conditions. It also features a blend of high-tech fabrics in a minimal design with taped seams instead of stitched for a the ultimate lightweight feel and comfort. Moisture wicking, fast drying materials ensure you stay comfortable and dry while the cut and design ensures it moves with you and doesn't feel restrictive when you run.