If you have old sport shoes that have seen better days, old socks with holes, or orphan socks that have lost their pair, don't toss them into a bin where they will ultimately end up in a landfilll, why not recycle them. I recently read that a pair of sport shoes can take 1000 years to decompose! For socks only, you can mail them to Zkano where they will be recycled into new textiles. 
https://zkano.com/pages/zkano-recycles

For those old sport shoes, you can take them to a Nike Reuse-a-Shoe Store. Nike has been taking the materials from old sneakers and recycling them.

https://s3-us-west-2.amazonaws......13.19.pdf