Because it is a foreign word, the person who transliterated "Doritos" into Hebrew used the samech /s/ instead of the sin /s/, so that there is no question that the last sound is an /s/, and not a shin /sh/. The Arabic transliterator used the sin /s/, and leaves it to the reader to be familiar enough with the word to know that it is not "Doritosh." Neither transliteration captures the American pronunciation of the assumed plural marker at the end of the word: [z], not [s] for "s." Photo of (used) wrapper follows.