I normally wear a 6M, but ordered up half size based on other reviews.  The 6.5M was a perfect fit.  This shoe is lovely soft leather and fit my feet like a pair of gloves right out of the box. The ankle strap is very easy to adjust and hits in just the right place to keep your heel in the shoe.  It also gives the shoe a dressy look that is good for ballroom and still casual enough for swing. I wore them to a dance the day after receiving them and danced the night away on happy feet...no break in needed.  I am an older gal with knee and ankle issues and a beginning ballroom and swing dancer.  I tried about 6 different pairs of dance shoes to find a pair that provided cushion, arch support, a solid wide heel, and a good fit.  I LOVE this shoe as do my feet.  One word of caution.  The sole and heel bottom are very slick leather.  Before I wore them to dance in I put them on, went out in my garage on the cement floor and did a couple twirls on the ball of my foot and a turn or two on the heels.  This made them just perfect on the wood floors that I dance on.  And, they are kept in a shoe bag and get carried into the dance room where I put them on......they do NOT get worn outside.