UGG Gershwin boots calf size

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Does anyone have these? How big do they come up round the calf please?

I've got these! I'd say they are quite generous on the calf (i can pull them off without unzipping). I'm quite slim but have fairly muscly calfs.

I have found an online review that gives the calf size as 14.5¨ - its odd the manufacturers dont give the range of measurement!

I am also a little bit wary because of the problems raised with UGG zips failing on a recent thread here. I think they'd be snug, which would put pressure on the zips.