"Men's Korsa® Fly Long Sleeve: The Korsa Fly Long Sleeve is a lightweight men's running top built for cooler mornings and transitional weather when a short sleeve isn't quite enough but a heavy layer feels like too much. It moves cleanly with your stride and stays breathable through changing effort levels, so you stay comfortable whether you're warming up or pushing the pace. If you tend to run in that in-between temperature range where you want just a bit more coverage without feeling weighed down, this is the long sleeve that fits that need.The Fly Long Sleeve is made from a performance knit blend that keeps things airy and movement-friendly from the first mile to the last. It works well on its own during cool-weather training runs or as a base layer under a vest or jacket when temperatures drop further. The fabric helps prevent overheating without sacrificing the coverage that makes a long sleeve worth reaching for in the first place. It's a straightforward, reliable everyday training top that doesn't get in your way.Why Our Fit Experts Love It""I grabbed the Fly Long Sleeve for an early morning run when it was that awkward temperature where I didn't want a jacket but knew a short sleeve wasn't going to cut it. It felt light and breathable the whole time - I honestly forgot I was wearing a long sleeve. It's the kind of top I keep coming back to when the weather can't make up its mind."" - Dave, Road Runner Sports Fit Expert, San Diego, CAWho It's Best ForThe Korsa Fly Long Sleeve is a strong choice for male runners who train regularly in cool or transitional conditions and want a breathable long sleeve that doesn't feel bulky or overdone. It suits runners who prefer lightweight coverage over heavy layering and want a top that works just as well solo as it does under outerwear. If you run early mornings or in variable weather and want a go-to technical long sleeve that keeps up without slowing you down, this one is worth adding to your rotation. VIP Family members can take the Fly Long Sleeve for a 90-Day test drive with our Perfect Fit Guarantee."