Pen Guy Silicone Swimming Cap Comfortable and durable silicone swimming cap. Caps are latex free. One size fits all. As penguin populations continue to dwindle around the world, our design team have come up with a novel way of saving everyone’s favourite little waddling bird. Not only will you feel happy in your beautiful swimwear, but the world will be happy to see a huge rebound in penguin numbers. This print has been produced via the latest direct digital printing technology, which means it is better for the environment as there is minimal wastage and water consumption in the printing process.