This is my 4th pair of NB shoes. I ordered a half a size larger than I wear in other brands like I always have with NB. Nice looking shoe. Says 623 LT3 on the tongue I knew this when I bought them from other reviews. They are fairly comfortable right out of the box but will get better with a little wear. I believe they are synthetic leather which I figured from other reviews and that most other 623 colors are synthetic leather. We will see how they hold up.