Colour coded socks to identify Port (red) and Starboard (green). At sea, an emergency can happen at any time, and it is vital that everything aboard can be clearly identified and described. Where 'left' and 'right' could lead to confusion, 'port' and 'starboard' are perfectly clear and unambiguous to a seafarer. Fits size 7-12 US Men. Made from 60% cotton 40% nylon.