The days of the plain old cotton t-shirt are over. With the advancement of fabric technology, there are garments more suited for temperature regulation and moisture transference.
Cotton is not the heaviest material, but when it's wet, it clings and does not allow airflow to the skin. This lack of airflow also keeps the fabric from drying.
Performance garments like our Active Wear tactical shirt allow the moisture from perspiration to be wicked away from the skin, increasing the circulation of air, which in turn regulates body temperature and maximizes performance.