Найти ошибку в предложении. Is the leather used for making these shoes good?

“Is the leather used for these shoes good?”

When corrected, this sentence should read, “Is leather used for these shoes well?”. The only two possible corrections that were made are The Definite Article \"the\" exclusion not to refer to a particular material that shoes were made from and adjective “good” was switched with adverb “well” because of its interrogative meaning.