Made with a nearly seamless design, the Nike Dri-FIT Knit Men's Short-Sleeve Running Top feels exceptionally smooth. Areas of more open knit allow for better airflow where you need it most. Its slim fit follows your body's shape closely so you can move freely. Strategic Ventilation The chest and upper back have more open, mesh-like knit stitching. This allows body heat to escape where you warm up most. Having the mesh areas knit into the fabric, rather than as separately sewn-in panels, keeps the top nearly seamless and ultra-smooth. Lasting Comfort With the only seams connecting the sleeves to the body, the sides of the top are super-smooth and soft. This premium construction provides a luxurious feel against your skin from start to finish. Stay Dry Dri-FIT Technology helps keep you dry and comfortable by wicking sweat away from your skin to the fabric's surface, where it quickly evaporates.