"What Our Gearhead® Experts Are Saying: ""This long sleeve is perfect for cool morning runs and shoulder season training. The Knit_Flow fabric is incredibly breathable and dries fast, and the flat seams mean zero irritation—even after hours on the move."" Some mornings call for just a little more coverage, and that’s where the Salomon Shakeout Core Long-Sleeve T-Shirt shines. Made with performance-driven Knit_Flow™ fabric, this lightweight layer delivers next-to-skin softness with built-in airflow and moisture management—so we stay dry and comfortable even as the miles stack up. It’s breathable enough to push the pace but warm enough to bridge the gap on brisk trail mornings. Flatlock seams eliminate irritation, and the 2-way stretch ensures we move freely whether we’re pacing the block or hitting an early trailhead. Reflective hits help keep us visible when light is low, and the classic fit layers easily under vests or jackets when the temps dip. It’s that versatile long sleeve we always reach for—before, during, and after the run."