A new hi-tech sock could spell an end to mismatched pairs - each sock contains a microchip which can be scanned using an iPhone app.
The app lets users check whether the socks they are wearing match, using a scanner which pairs with a free app for iPhone.
The socks, called 'Plus+ socks' have a waterproof radio chip which records how many times the sock has been washed, how black it is, and whether it needs replacing.
The RFID chips inside are similar to the ones used in company door passes and in contactless credit cards.
Each sock is given an individual electronic identity tag, allowing the user to quickly pair up errant socks.
A spokesman for Swiss manufacturer Blacksocks said: "For socks, as in real life, only those things that go together really belong together.
"If you have ever sorted socks, you know it is not that easy to find the right and left socks that go together after the wash."
The Plus+ socks are available from www.blacksocks.com priced around £12. The app is free in the App Store.