I have Sidi Adventure Goretex which are fantastic as already mentioned. But for my last trip in the heat, biking and hiking in the mountains of Southern Europe I took these:
and wore a set of hard armoured dainese knee/shin pads. This combination worked really well for me both on and off the bike. Went through a couple of proper torrential days early in the trip and, paired with some cheap gaiters to keep the water out of the top of the boot, my feet stayed bone dry.