The Adidas Ultra Boost sneakers are very popular these days and although they are very comfortable for a medium sized foot, they don't work for a wide foot. I see one reviewer saying the exact opposite, noting that they had plenty of room in the toe box, but I've worn wide shoes for years and the Ultraboost is definitely too narrow for my foot. Another reviewer said the shoe fits like a sock, which I think is the perfect description. The shoe is very snug on the foot and almost feels like a sock, but if you have wide feet this shoe will feel quite snug. I also agree with the sentiment I've seen in some other reviews that you should order half a size larger than your normal shoe size.