MUCKWomen's Arctic Adventure Tall Boot

What is the cold Temp. rating for these boots?

The sizing says 7 m us is this male sizing

I see that these say they are talli am 5 foot tall how high would these go? also i am a 6/12 7 depending on the shoe should i order a size down?

Are these ideal for ice fishing ? Aka sitting still in pretty cold temps for several hours