I have a high arch and wear 7.5.

These sandals are light weight and comfortable. But they run a little small. I couldn't get my foot to slide into them very easily. Even after adjusting the lacing, I had to really push my foot and pull on the straps. Once on, my little toe pops out of the side and my heel was at the very edge of the back of shoe.

I like the style, but am returning them. Not sure if I'll try half size up or not.