This is my 3rd pair of Merrell Pace Glove Barefoot shoes & they are great. I have extreme high arches, narrow heels & am very hard to fit. I get my regular size if to wear barefoot or a half size larger for wearing with socks & perfect fit. I have noticed less knee and foot pain that when wearing shoes with special arches to accomodate my high arches-so was hesitant about my first pair. These fit the best of the barefoot styles I've gotten.