10.5 and ordered a month later, after about 15 days of wearing, they are too big. About half size. I immediately bought a pair of Twisted X Eco lace-up shoes in one size, they fit perfectly and are very comfortable. It's like they reached out and now I can't get them back. Tinkered like this because I really like them, they're really comfortable. I love them so much I'm considering buying a half size smaller and giving this pair as gifts!