Scott,
I'm currently using the Simms Freestone felt sole boot (also using Simms waders). I bought them in May of 2016. I wear a size 11 shoe and I ordered a size 12 wading boot and with just the wader bootie inside they are quite comfortable, not tight at all. If I were to add some additional insulator type socks I think I might go up an additional size. Hope that helps.