I wear these (Snake Guards):
They're kind of warm to wear, but not as bad as boots or chaps. Easy to put on/take off, they also make great brush guards. For warm weather footware, I wear surplus marine-issued TFX desert boots with these guards
Of course, this combo offers no protection if you sit your rump on a rattle bug! I'm dealing with the smaller prairie rattlers up here. With those huge southern snakes, I might consider full length chaps