"Women's On® Core-T: Sometimes the best running shirt is the one you reach for without thinking. The Women's On® Core-T is a lightweight short sleeve tee built for everyday runners who want something simple, comfortable, and easy to wear. It fits with a regular, relaxed cut that feels classic without being clingy - so whether you're heading out for a morning run or layering it into your daily routine, it stays out of your way and lets you focus on the run.The Core-T is made with lightweight fabrics that keep things feeling easy on the move. Its single-color design makes it a natural fit with the rest of your running kit, and the straightforward styling means it works across seasons - not just on warm days. If you're looking for a go-to women's running top that doesn't overcomplicate things, this is it.Why Our Fit Experts Love It""I keep coming back to the Core-T because it's just easy. I threw it on for a casual run and didn't think about it once - which is exactly what you want from a training tee. The fit isn't too tight or too loose, and the single color makes it simple to pair with anything in my drawer."" - Rachel, Road Runner Sports Fit Expert, Carlsbad, CAWho It's Best ForThe Core-T is a great match for women runners who want a reliable, no-fuss short sleeve tee for everyday training. If you prefer a relaxed, comfortable fit over a compression or athletic cut, and you want a running shirt that works across different weather and conditions without a lot of extra features, this one fits the bill. It's also a solid choice if you're building out a simple, versatile running wardrobe and want pieces that mix and match easily. VIP Family members can take the Core-T for a 90-Day test drive with our Perfect Fit Guarantee."