SilverSpun® is a light weight sock yarn made out of non-animal fiber... and including, you guessed it - silver! Why is SilverSpun® so smart?! 1. Because, with gloves made out of it, you can use your smartphone (the silver is conductive)! 2. Because the silver in the yarn inhibits the growth of odor causing bacteria (perfect for non-stinky socks... which is, ahem, smart for us all!). SilverSpun®, produced for us exclusively by The Feel Good Yarn Co., also has excellent thermal properties and is specifically a blend of soft cotton, nylon for strength, spandex for stretch, and silver (for smart-ness)!