This sock-clip system was developed in Finland and has a worldwide patent.;The SUPI sock-clips are made of polypropylene and also resistant to machine-washing with temperatures up to 90Ã’Â°C as to spin and tumble drying.;15 pieces (5 in each red, blue and yellow) of SUPI sock-clips neaten your socks.;The application is so easy, SUPIs are available in six different colours.;Searching and sorting of socks after each washing is no longer necessary.