https://smartwool.ca/en/second-cut-project.html?fbclid=IwAR16Dhq2dmPcTBxjF9zy5OrNe5a_o4T1Kq-QCcZwBJnrAHJ7xS5PhA79EoM#how-does-it-work
Great initiative to prevent socks in landfills! Of course mend your socks until they can no longer be repaired. Another trick is to have multiple of the same socks so when one wears out you can keep using the still good sock.
GW