The instructions suggest you get a size smaller if you're a woman ordering these. I normally take a 7 or a 7.5 (but mostly 7s). So I ordered the size 6. I also ordered a 7 because rounding up would be an 8 and the size I should order would be a 7. The size 6 were so small, my big toe touched the end of the shoe. Then I tried the 7. It's big but once I put on a wool sock it'll be fine, I think.

One word of advice: If you have thick calves these are going to be snug. I probably won't be able to get the waterproof shell and base layer inside the boot where I would rather have it. I'll see if that even matters.

ETA, 4/29/18:
I've had a lot of time in the water with this pair and I absolutely love them. They're waterproof and warm. We've been out on just thawed water in 40 degree temps and my feet were toasty. A thick pair of Vermont Darned Tough socks round out the setup quite nicely. Getting my splash pants inside the boot proved impossible. It didn't matter in the end as the strap snugs down enough and the boots are tall enough that the setup keeps me dry.

It's so nice to be able to walk into the water and not worry about getting wetat this time of year the water is very cold and getting wet would be bad. I also discovered another reason to wear them: leeches. We were in a pond yesterday and the bottom of our boats each had several leeches on them. The idea of walking around getting into the boat with those things lurking? I was super glad to have knee high boots on. I love my boots so much my husband is going to get a pair (especially after the leeches incident <g>).