SAILORS' SOCKS

Wilson is on a roll, invention-wise!
It's only a couple of days since he launched his newly invented Calendar, and now he's come up with this: LIFE-SAVING SOCKS!
He says his inventive rush has been brought about by increasing his consumption of 'brain food' Cheesy Wotsits – which has also added a few cm around his tummy.
Anyway, following the recent successes of Team GB in the Olympic Sailing events, Wilson is certain that there will be a surge in the number of people taking up sailing for the first time.
Due to his legendary dislike of water Wilson will not be among them – but that hasn't stopped him from making another 'amazing' new invention: Navigation Socks.
According to Wilson, first-time sailors are notorious for muddling up Port and Starboard, so he's invented a pair of socks to remind them which is which.
He has named this boon for boat owners Sox4C-dogs.