Lighter than half a helium balloon and more breathable than a screen porch, the Salomon Trail Runner Men's Tank Top is perfect foryou guessed it!trail running, though it's also great for running on the road, hiking, and backpacking, too. Actilite Micro Stretch fabric moves with you to keep you cool and comfortable, and the Trail Runner's flatlock seams prevent chafing under a pack and during long afternoons on the trail. ActiLite Micro Stretch fabric. Flatlock seams. Reflective details.