"Men's On® Core-T: The Men's On Core-T is a short sleeve running tee built for runners who want a reliable, no-fuss top for daily training and long runs. It keeps things simple - lightweight construction means you're not carrying extra weight on the run, and the clean single-color design makes it easy to grab and go without overthinking your kit. If you've been looking for a road running shirt that just works, this is it.The Core-T is made with a lightweight, versatile fabric that holds up across seasons - wear it on its own during warmer months or layer it when temperatures drop. The straightforward fit stays out of your way whether you're logging easy miles or pushing through a longer effort. There's no complicated construction here, just a well-made running shirt that earns a regular spot in your rotation.Why Our Fit Experts Love It""I reached for the Core-T on a longer training run and was surprised by how little I noticed it - which is exactly what you want from a running shirt. It felt light, moved well, and I wasn't thinking about it at mile eight. That's a win."" - Sean, Road Runner Sports Fit Expert, Chula VistaWho It's Best ForThe Men's On Core-T is a strong pick for runners who want a lightweight short sleeve tee that handles daily training and long runs without any extra fuss. It works well for road runners who prefer a clean, classic look and want a top that layers easily when the weather shifts. If you value simplicity and consistent comfort in your running apparel, this tee fits the bill. VIP Family members can take the Core-T for a 90-Day test drive with our Perfect Fit Guarantee."