The Cumulus Tank uses the most advanced wicking, cooling and odor control technologies. Unlike traditional wicking that washes off over time, Delta™ technology is built into the fibers and uses specialized knit construction with both hydrophobic and hydrophilic yarns for advanced control of body moisture dispersal. These patent-pending radiating knit structures keep you cooler in hot conditions and high-aerobic activities by increasing airflow to dissipate heat.