Heads Double Power Drag Short is a reversible swim training short in black and orange that is worn over your swimwear to create drag and resistance in the water, so that you have to work harder to swim. This intense swim workout will build up your body strength and stamina and is a great swim training tool to use if you only have a short time to train, as you will still get an intense workout in a shorter period of time than if you were swimming for longer wearing no drag short.