This is my wife's review:

After reading MANY reviews, I was torn on what size to buy.

For reference: I am 5'7", 120lbs

My ankles are ~8 inches in circumference.
The largest part of my calves measure ~11.5 inches in circumference.

A list of shoes, boots, and sandals by different designers I own and what sizes I wear:

Size 7 in Vince Camuto boots
Size 7 in Fergie boots
Size 7 in Coach Rain Boots
Size 7.5 in Nike sneakers
Size 7 in Jessica Simpson pumps
Size 8 in UGG Boots
Size 7 in Cole Haan sandals
Size 7 in Sperry sandals
Size 7 in Reef flip flops
Size 38 in ALDO Boots

With that being said, I did order a Size 7 in these rain boots the first time around. I figured I was a 7 in most everything, so I assumed I would be good to go. My Size 7 rain boots arrived and when I tried them on,  my toes were touching the front part of the boot! It was SO close to almost being a good fit. If only they made these in a 7.5!

I put them right back in the bag and started my refund. I then placed my order for the Size 8 AND a pair of the Polar Boot socks. I got a Medium in the socks. I had read a few other people say that the extra fluff in the boot sock will help make the boot nice and snug - but not overly tight and uncomfortable.

When my Size 8's arrived, I was worried there would be a lot of extra space in the boots, but surprisingly they fit more like a 7.5. It wasn't a huge gap at the front part of the boot like I had thought it would be. I had a pair of thin ankle socks on, so I slipped on the boot socks over my socks and put them into the boots - PERFECT fit! :)

These boots are a bit tricky to get off. You need to sit down and sort of twist and tug the bottom of the boot, and then they come off pretty easily this way. If you have larger ankles or calves, these would most likely be too tight. There is still a slight gap at the top of the boot and while I wish it was made to be a BIT more of a slimmer fit around my legs, I've realized rain boots are supposed to have this floppy, sort of look to them. I've come to accept this fact and figure this is as good as it will probably get - unless I spend hundreds of dollars on custom made boots.

For $30, I'll rock my new pink rain boots and be happy I didn't spend almost $200 on designer rain boots!  :)