New this season, the Muscle Long Sleeve top. A running long sleeve top that accomplishes what we love best: combining a fierce, and movement-ready silhouette with details that cause double takes. Our Solid Lux body fabric is ultra soft, but also mileage and hard workout ready. Mesh panels at the shoulders give visual interest and let your heat rise and escape. Additional mesh at the hem kicks this style up a notch, taking it from sport top to style piece.