Originally bought 12W, as I wear size 12 shoes.  I found that they were too snug (left to right was okay, but the top of the boot felt tight) and exchanged for 13 regular.  They fit fine now.  I love the zipper, makes it so much easier taking on and off.  Boots are pretty quiet and provide decent tread.  Thankfully I haven't worn them in the snow, the rain or hot temps yet...