Buy Oats online today! Oats, like barley, have a hard outer hull that must be removed before it’s ready for human consumption. Even though the outer hull of an oat kernel comes off easier than a barley kernel’s hull, it’s still not within reach of the average consumer to accomplish this. For this reason, if you want whole oats to eat, purchase them already hulled. Hulled oats, called oat groats, look very much like rye or Triticale.