The Zero Rules™ Short Sleeve Shirt for women by Columbia is a minimalist design t-shirt designed for your most intense endurance activities like long hikes. Indeed, the t-shirt developed by Columbia combats heat thanks to its Omni-Wick technology, allowing for thermoregulation of your body during exertion. 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 Omni-Shade™: UPF 30 sun protection Stretch fabric: more comfort Anti-microbial treatment Columbia - Zero Rules? Short Sleeve Shirt - T-Shirt - Women's