Muck BootsUnisex's Derwent Ii All Purpose Field Boot

Hi. I take 9.5 but already have a pair of mucks 9 and they're a good fit. Has sizing changed? Thanks

How high are these boots in inches/cms?

I am a size 5 normally but as these are unisex would you suggest a smaller size?

Are these mens boots only or unisex, ie are the smaller sizes suitable for women?