Hemp: the sails of Columbus’s ships were woven of it. The Declaration of Independence was written on it. It was once America’s largest cash crop – used for fabric, rope, paper and more. George Washington and Thomas Jefferson even grew it as a matter of patriotic duty. Hemp is an unsung hero of fabrics and the main ingredient in a shirt of uncommon breathability, softness and character. Mixed with organic cotton and given a tenderizing enzyme wash, it has a cool, manly character that’ll see you through the steamy dog days of summer.