Fits well out of the box. Size 11 fits comfortably even though I'm 10.5. The snug fit at the ankle keeps snow and cold out. Say well done. My wife and I have 2 other tall muck boots. All work well and hold up.
Pros
I needed a fully waterproof shoe for gardening so I went with Mucks. I'm glad I did, arrived quickly as expected.
Cons
The upper of the shoe is too narrow for my feet. Returned item. I'm sorry