The men's t-shirt, Zero Rules Short Sleeve Shirt from Columbia, is a minimalist design t-shirt designed for your most intense endurance activities like long hikes. Indeed, the t-shirt developed by Columbia fights heat thanks to its Omni-Wick technology, allowing your body to thermoregulate during your efforts. Made with a cooling and breathable fabric, the Zero Rules Short Sleeve Shirt manages heat by reacting to your sweat to lower your body temperature. With the Zero Rules Short Sleeve Shirt on your shoulders, combining style and comfort is no longer a problem! Material: 100% polyester Omni-Freeze Zero™: sweat-activated cooling Omni-Wick™: allows for good body thermoregulation - optimal moisture wicking Stretch fabric: more comfort Anti-microbial treatment Columbia Zero Rules Short Sleeve Shirt - T-Shirt - Men's