I recently visited Rome in the blazing heat and settled on these pants to wear during the day. They're breathable, but not see through, and I was able to wear normal nude underwear with no visibility. I loved them so much I ordered in the black and wore them for a full day of train/plane travel. I'm a true size 14 and ordered the L and XL to try. Kept the XL for more comfort and they are the perfect size. Love them!