Both snow socks and snow chains are legal in Andorra as per the article 74 here.
Please, let me know if you have any question,
Snow Chains or Socks
We are travelling to Arinsal in February half term for our 7th ski holiday there. We have got snow socks for the car we hire in Barcelona as we were told that these would be the legal requirement (we know snow chains are too). However, reading on websites about the legalities, only snow chains are mentioned. Are snow socks ok or do I need to get snow chains to avoid a fine.