"Men's On® Core Tank: When the temperature climbs and the effort picks up, the Men's On Core Tank keeps things simple - lightweight, breathable, and out of your way. This men's running tank is built for warm-weather training runs, high-intensity workouts, and race-day efforts where staying cool matters as much as staying focused. The sleeveless design gives your arms full freedom of movement, so nothing interrupts your stride when you're pushing the pace.The fabric blend - 92% polyester and 8% elastane - keeps the tank light and flexible while helping moisture move away from your skin during harder efforts. The elastane adds just enough stretch so the fit moves with you rather than against you. The streamlined cut stays close without feeling restrictive, which means fewer distractions whether you're logging summer miles or grinding through a track session.Why Our Fit Experts Love It""I reach for this tank on hot morning runs when I want to feel like I'm wearing as little as possible without actually wearing nothing. The fabric dries fast, it doesn't bunch up, and it pairs easily with any shorts I grab. Simple, but it does exactly what you need it to do."" - Sean, Road Runner Sports Fit Expert, Chula Vista, CAWho It's Best ForThe On Core Tank is a strong pick for men who run in warm or hot conditions and want a no-fuss tank that manages sweat and stays comfortable from the first mile to the last. If you prefer a lightweight, breathable running tank that moves freely and doesn't distract you during faster workouts or race efforts, this one fits the bill. It works equally well for everyday training runs and higher-intensity sessions where heat and moisture are the main challenges. VIP Family members can take the Core Tank for a 90-Day test drive with our Perfect Fit Guarantee."