The gore-tex membrane can and will rub off if not protected. I wouldn't use it for a tarp or a sock because of that. I think stuffing it away time after time could destroy that very fragile membrane and make you tarp a shower head in a rain storm and your sock less than ideal. I have a bivy bag made from 3 layer gore Tex and it's not waterproof anymore after just 1 season (winter camping).
--If a cow laughs hard, does milk come out its nose?