T-Shirts › Mayonnaise T-Shirt Image 1 of 3 Image 2 of 3 Image 3 of 3 Mayonnaise T-Shirt £25.00 sold out 100% organic cotton unisex t-shirts printed using low waste ink technology in the UK, in a renewable energy powered factory. Size: Medium Large X Large Sold Out Added! 100% organic cotton unisex t-shirts printed using low waste ink technology in the UK, in a renewable energy powered factory.