What Our Gearhead® Experts Are Saying: "I wear the Core T-Shirt constantly—around camp, to the gym, or just hanging out. It’s got that perfect worn-in softness right out of the package, and it holds up great after washes. Just an all-around reliable tee." We keep the Mammut Core T-Shirt in heavy rotation for its clean look and unbeatable comfort. Made from 100% organic cotton, it delivers the kind of softness we crave from sunrise coffee to sunset campfires. As part of Mammut’s essential logowear collection, it keeps things simple and versatile—perfect for pulling on after a climb, layering under a flannel, or relaxing on rest days. Whether we’re headed into town or out for a hike, this tee is a staple we reach for every time.