We have ponies, and over winter I spend an awful lot of time traipsing through the mud on the farm to see to them. I received a pair of blue baobab gumboots from a kind friend when I turned 40, but my teenage daughter "reapproppriated" them last year. I went through two pairs of cheap gumboots this winter, both of which split after a couple months of wear, before ordering a pair from Blue Baobab. I wish I'd done it sooner!
Size up - the fit is on the smaller side.