To use this Under Armour Marlin short sleeve shirt, simply put it on like you would any other shirt. It's suitable for various occasions, such as casual outings or workouts. When it comes to care, machine - wash it in cold water with like colors to keep the colors vibrant. Tumble dry on low to prevent shrinking. Avoid using bleach as it may damage the fabric. Also, don't iron directly on any logos or prints to maintain their quality.