Khuffayn, leather socks and masah
Khuffayn are foot coverings associated with masah, wiping over footwear under particular ablution conditions. Product descriptions and religious conditions need to be distinguished. Dar al-Ifta discusses criteria and differing views concerning socks; purchasing something labelled masah does not settle those interpretations.
Practical checks: khuffayn, leather socks and masah
Inspect ankle coverage, construction, size and precise material composition. For when and how to perform masah, consult qualified guidance within the tradition you follow rather than advertising. The resources separate religious conditions from product comparison and care information.