Tetra-Cool™ is a noticeably lighter and cooler fabric than Propel™ thanks to its 4-channel moisture wicking knit which is built to channel moisture away from your skin and to the exterior of the fabric for great evaporative cooling.  This excellent design allows it to move more moisture faster than traditional fabrics without adding weight or reducing coverage.  This lighter weight brings you additional comfort and it’s practically famous for its soft feel making it one of our most popular fabric choices.  All in all it keeps you cooler longer even under intense physical activity, making it easier for you to enjoy your favorite hobbies the most in or outdoors!